diff --git a/webrtc/modules/desktop_capture/BUILD.gn b/webrtc/modules/desktop_capture/BUILD.gn
index 0c427993d4..151627de39 100644
--- a/webrtc/modules/desktop_capture/BUILD.gn
+++ b/webrtc/modules/desktop_capture/BUILD.gn
@@ -63,6 +63,7 @@ if (rtc_include_tests) {
       "desktop_frame_rotation_unittest.cc",
       "desktop_region_unittest.cc",
       "differ_block_unittest.cc",
+      "fallback_desktop_capturer_wrapper_unittest.cc",
       "mouse_cursor_monitor_unittest.cc",
       "rgba_color_unittest.cc",
       "test_utils.cc",
@@ -185,6 +186,8 @@ rtc_static_library("desktop_capture") {
     "desktop_frame_win.h",
     "differ_block.cc",
     "differ_block.h",
+    "fallback_desktop_capturer_wrapper.cc",
+    "fallback_desktop_capturer_wrapper.h",
     "mac/desktop_configuration.h",
     "mac/desktop_configuration.mm",
     "mac/desktop_configuration_monitor.cc",
diff --git a/webrtc/modules/desktop_capture/fake_desktop_capturer.cc b/webrtc/modules/desktop_capture/fake_desktop_capturer.cc
index bd4c37e8b5..ea622650b8 100644
--- a/webrtc/modules/desktop_capture/fake_desktop_capturer.cc
+++ b/webrtc/modules/desktop_capture/fake_desktop_capturer.cc
@@ -14,17 +14,21 @@
 
 namespace webrtc {
 
-FakeDesktopCapturer::FakeDesktopCapturer()
-    : callback_(nullptr),
-      result_(DesktopCapturer::Result::SUCCESS),
-      generator_(nullptr) {}
-
+FakeDesktopCapturer::FakeDesktopCapturer() = default;
 FakeDesktopCapturer::~FakeDesktopCapturer() = default;
 
 void FakeDesktopCapturer::set_result(DesktopCapturer::Result result) {
   result_ = result;
 }
 
+int FakeDesktopCapturer::num_frames_captured() const {
+  return num_frames_captured_;
+}
+
+int FakeDesktopCapturer::num_capture_attempts() const {
+  return num_capture_attempts_;
+}
+
 // Uses the |generator| provided as DesktopFrameGenerator, FakeDesktopCapturer
 // does
 // not take the ownership of |generator|.
@@ -38,10 +42,17 @@ void FakeDesktopCapturer::Start(DesktopCapturer::Callback* callback) {
 }
 
 void FakeDesktopCapturer::CaptureFrame() {
+  num_capture_attempts_++;
   if (generator_) {
+    if (result_ != DesktopCapturer::Result::SUCCESS) {
+      callback_->OnCaptureResult(result_, nullptr);
+      return;
+    }
+
     std::unique_ptr<DesktopFrame> frame(
         generator_->GetNextFrame(shared_memory_factory_.get()));
     if (frame) {
+      num_frames_captured_++;
       callback_->OnCaptureResult(result_, std::move(frame));
     } else {
       callback_->OnCaptureResult(DesktopCapturer::Result::ERROR_TEMPORARY,
diff --git a/webrtc/modules/desktop_capture/fake_desktop_capturer.h b/webrtc/modules/desktop_capture/fake_desktop_capturer.h
index 33073a00f7..9cab2d6ede 100644
--- a/webrtc/modules/desktop_capture/fake_desktop_capturer.h
+++ b/webrtc/modules/desktop_capture/fake_desktop_capturer.h
@@ -43,6 +43,14 @@ class FakeDesktopCapturer : public DesktopCapturer {
   // does not take the ownership of |generator|.
   void set_frame_generator(DesktopFrameGenerator* generator);
 
+  // Count of DesktopFrame(s) have been returned by this instance. This field
+  // would never be negative.
+  int num_frames_captured() const;
+
+  // Count of CaptureFrame() calls have been made. This field would never be
+  // negative.
+  int num_capture_attempts() const;
+
   // DesktopCapturer interface
   void Start(DesktopCapturer::Callback* callback) override;
   void CaptureFrame() override;
@@ -55,10 +63,12 @@ class FakeDesktopCapturer : public DesktopCapturer {
   static constexpr DesktopCapturer::SourceId kWindowId = 1378277495;
   static constexpr DesktopCapturer::SourceId kScreenId = 1378277496;
 
-  DesktopCapturer::Callback* callback_;
+  DesktopCapturer::Callback* callback_ = nullptr;
   std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
-  DesktopCapturer::Result result_;
-  DesktopFrameGenerator* generator_;
+  DesktopCapturer::Result result_ = Result::SUCCESS;
+  DesktopFrameGenerator* generator_ = nullptr;
+  int num_frames_captured_ = 0;
+  int num_capture_attempts_ = 0;
 };
 
 }  // namespace webrtc
diff --git a/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.cc b/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.cc
new file mode 100644
index 0000000000..e8762ada11
--- /dev/null
+++ b/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.cc
@@ -0,0 +1,159 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.h"
+
+#include <utility>
+
+#include "webrtc/base/checks.h"
+
+namespace webrtc {
+
+namespace {
+
+// Implementation to share a SharedMemoryFactory between DesktopCapturer
+// instances. This class is designed for synchronized DesktopCapturer
+// implementations only.
+class SharedMemoryFactoryProxy : public SharedMemoryFactory {
+ public:
+  // Users should maintain the lifetime of |factory| to ensure it overlives
+  // current instance.
+  static std::unique_ptr<SharedMemoryFactory> Create(
+      SharedMemoryFactory* factory);
+  ~SharedMemoryFactoryProxy() override;
+
+  // Forwards CreateSharedMemory() calls to |factory_|. Users should always call
+  // this function in one thread. Users should not call this function after the
+  // SharedMemoryFactory which current instance created from has been destroyed.
+  std::unique_ptr<SharedMemory> CreateSharedMemory(size_t size) override;
+
+ private:
+  explicit SharedMemoryFactoryProxy(SharedMemoryFactory* factory);
+
+  SharedMemoryFactory* factory_ = nullptr;
+  rtc::ThreadChecker thread_checker_;
+};
+
+}  // namespace
+
+SharedMemoryFactoryProxy::SharedMemoryFactoryProxy(
+    SharedMemoryFactory* factory) {
+  RTC_DCHECK(factory);
+  factory_ = factory;
+}
+
+// static
+std::unique_ptr<SharedMemoryFactory>
+SharedMemoryFactoryProxy::Create(SharedMemoryFactory* factory) {
+  return std::unique_ptr<SharedMemoryFactory>(
+      new SharedMemoryFactoryProxy(factory));
+}
+
+SharedMemoryFactoryProxy::~SharedMemoryFactoryProxy() = default;
+
+std::unique_ptr<SharedMemory>
+SharedMemoryFactoryProxy::CreateSharedMemory(size_t size) {
+  RTC_DCHECK(thread_checker_.CalledOnValidThread());
+  return factory_->CreateSharedMemory(size);
+}
+
+FallbackDesktopCapturerWrapper::FallbackDesktopCapturerWrapper(
+    std::unique_ptr<DesktopCapturer> main_capturer,
+    std::unique_ptr<DesktopCapturer> secondary_capturer)
+    : main_capturer_(std::move(main_capturer)),
+      secondary_capturer_(std::move(secondary_capturer)) {
+  RTC_DCHECK(main_capturer_);
+  RTC_DCHECK(secondary_capturer_);
+}
+
+FallbackDesktopCapturerWrapper::~FallbackDesktopCapturerWrapper() = default;
+
+void FallbackDesktopCapturerWrapper::Start(
+    DesktopCapturer::Callback* callback) {
+  // FallbackDesktopCapturerWrapper catchs the callback of the main capturer,
+  // and checks its return value to decide whether the secondary capturer should
+  // be involved.
+  main_capturer_->Start(this);
+  // For the secondary capturer, we do not have a backup plan anymore, so
+  // FallbackDesktopCapturerWrapper won't check its return value any more. It
+  // will directly return to the input |callback|.
+  secondary_capturer_->Start(callback);
+  callback_ = callback;
+}
+
+void FallbackDesktopCapturerWrapper::SetSharedMemoryFactory(
+    std::unique_ptr<SharedMemoryFactory> shared_memory_factory) {
+  shared_memory_factory_ = std::move(shared_memory_factory);
+  if (shared_memory_factory_) {
+    main_capturer_->SetSharedMemoryFactory(
+        SharedMemoryFactoryProxy::Create(shared_memory_factory_.get()));
+    secondary_capturer_->SetSharedMemoryFactory(
+        SharedMemoryFactoryProxy::Create(shared_memory_factory_.get()));
+  } else {
+    main_capturer_->SetSharedMemoryFactory(
+        std::unique_ptr<SharedMemoryFactory>());
+    secondary_capturer_->SetSharedMemoryFactory(
+        std::unique_ptr<SharedMemoryFactory>());
+  }
+}
+
+void FallbackDesktopCapturerWrapper::CaptureFrame() {
+  RTC_DCHECK(callback_);
+  if (main_capturer_permanent_error_) {
+    secondary_capturer_->CaptureFrame();
+  } else {
+    main_capturer_->CaptureFrame();
+  }
+}
+
+void FallbackDesktopCapturerWrapper::SetExcludedWindow(WindowId window) {
+  main_capturer_->SetExcludedWindow(window);
+  secondary_capturer_->SetExcludedWindow(window);
+}
+
+bool FallbackDesktopCapturerWrapper::GetSourceList(SourceList* sources) {
+  if (main_capturer_permanent_error_) {
+    return secondary_capturer_->GetSourceList(sources);
+  }
+  return main_capturer_->GetSourceList(sources);
+}
+
+bool FallbackDesktopCapturerWrapper::SelectSource(SourceId id) {
+  if (main_capturer_permanent_error_) {
+    return secondary_capturer_->SelectSource(id);
+  }
+  return main_capturer_->SelectSource(id) &&
+         secondary_capturer_->SelectSource(id);
+}
+
+bool FallbackDesktopCapturerWrapper::FocusOnSelectedSource() {
+  if (main_capturer_permanent_error_) {
+    return secondary_capturer_->FocusOnSelectedSource();
+  }
+  return main_capturer_->FocusOnSelectedSource() ||
+         secondary_capturer_->FocusOnSelectedSource();
+}
+
+void FallbackDesktopCapturerWrapper::OnCaptureResult(
+    Result result,
+    std::unique_ptr<DesktopFrame> frame) {
+  RTC_DCHECK(callback_);
+  if (result == Result::SUCCESS) {
+    callback_->OnCaptureResult(result, std::move(frame));
+    return;
+  }
+
+  if (result == Result::ERROR_PERMANENT) {
+    main_capturer_permanent_error_ = true;
+  }
+  secondary_capturer_->CaptureFrame();
+}
+
+}  // namespace webrtc
diff --git a/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.h b/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.h
new file mode 100644
index 0000000000..1ef3b6f7c9
--- /dev/null
+++ b/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.h
@@ -0,0 +1,62 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_FALLBACK_DESKTOP_CAPTURER_WRAPPER_H_
+#define WEBRTC_MODULES_DESKTOP_CAPTURE_FALLBACK_DESKTOP_CAPTURER_WRAPPER_H_
+
+#include <memory>
+
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+#include "webrtc/modules/desktop_capture/desktop_capture_types.h"
+#include "webrtc/modules/desktop_capture/desktop_frame.h"
+#include "webrtc/modules/desktop_capture/shared_memory.h"
+
+namespace webrtc {
+
+// A DesktopCapturer wrapper owns two DesktopCapturer implementations. If the
+// main DesktopCapturer fails, it uses the secondary one instead. Two capturers
+// are expected to return same SourceList, and the meaning of each SourceId is
+// identical, otherwise FallbackDesktopCapturerWrapper may return frames from
+// different sources. Using asynchronized DesktopCapturer implementations with
+// SharedMemoryFactory is not supported, and may result crash or assertion
+// failure.
+class FallbackDesktopCapturerWrapper final : public DesktopCapturer,
+                                             public DesktopCapturer::Callback {
+ public:
+  FallbackDesktopCapturerWrapper(
+      std::unique_ptr<DesktopCapturer> main_capturer,
+      std::unique_ptr<DesktopCapturer> secondary_capturer);
+  ~FallbackDesktopCapturerWrapper() override;
+
+  // DesktopCapturer interface.
+  void Start(DesktopCapturer::Callback* callback) override;
+  void SetSharedMemoryFactory(
+      std::unique_ptr<SharedMemoryFactory> shared_memory_factory) override;
+  void CaptureFrame() override;
+  void SetExcludedWindow(WindowId window) override;
+  bool GetSourceList(SourceList* sources) override;
+  bool SelectSource(SourceId id) override;
+  bool FocusOnSelectedSource() override;
+
+ private:
+  // DesktopCapturer::Callback interface.
+  void OnCaptureResult(Result result,
+                       std::unique_ptr<DesktopFrame> frame) override;
+
+  const std::unique_ptr<DesktopCapturer> main_capturer_;
+  const std::unique_ptr<DesktopCapturer> secondary_capturer_;
+  std::unique_ptr<SharedMemoryFactory> shared_memory_factory_;
+  bool main_capturer_permanent_error_ = false;
+  DesktopCapturer::Callback* callback_ = nullptr;
+};
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_FALLBACK_DESKTOP_CAPTURER_WRAPPER_H_
diff --git a/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper_unittest.cc b/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper_unittest.cc
new file mode 100644
index 0000000000..b3bf51b733
--- /dev/null
+++ b/webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper_unittest.cc
@@ -0,0 +1,205 @@
+/*
+ *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/modules/desktop_capture/fallback_desktop_capturer_wrapper.h"
+
+#include <memory>
+#include <utility>
+#include <vector>
+
+#include "webrtc/modules/desktop_capture/desktop_capturer.h"
+#include "webrtc/modules/desktop_capture/desktop_frame_generator.h"
+#include "webrtc/modules/desktop_capture/fake_desktop_capturer.h"
+#include "webrtc/test/gtest.h"
+
+namespace webrtc {
+
+namespace {
+
+std::unique_ptr<DesktopCapturer> CreateDesktopCapturer(
+    PainterDesktopFrameGenerator* frame_generator) {
+  std::unique_ptr<FakeDesktopCapturer> capturer(new FakeDesktopCapturer());
+  capturer->set_frame_generator(frame_generator);
+  return std::move(capturer);
+}
+
+class FakeSharedMemory : public SharedMemory {
+ public:
+  explicit FakeSharedMemory(size_t size);
+  ~FakeSharedMemory() override;
+
+ private:
+  static int next_id_;
+};
+
+// static
+int FakeSharedMemory::next_id_ = 0;
+
+FakeSharedMemory::FakeSharedMemory(size_t size)
+    : SharedMemory(new char[size], size, 0, next_id_++) {}
+
+FakeSharedMemory::~FakeSharedMemory() {
+  delete[] static_cast<char*>(data_);
+}
+
+class FakeSharedMemoryFactory : public SharedMemoryFactory {
+ public:
+  FakeSharedMemoryFactory() = default;
+  ~FakeSharedMemoryFactory() override = default;
+
+  std::unique_ptr<SharedMemory> CreateSharedMemory(size_t size) override;
+};
+
+std::unique_ptr<SharedMemory> FakeSharedMemoryFactory::CreateSharedMemory(
+    size_t size) {
+  return std::unique_ptr<SharedMemory>(new FakeSharedMemory(size));
+}
+
+}  // namespace
+
+class FallbackDesktopCapturerWrapperTest : public testing::Test,
+                                           public DesktopCapturer::Callback {
+ public:
+  FallbackDesktopCapturerWrapperTest();
+  ~FallbackDesktopCapturerWrapperTest() override = default;
+
+ protected:
+  std::vector<std::pair<DesktopCapturer::Result, bool>> results_;
+  FakeDesktopCapturer* main_capturer_ = nullptr;
+  FakeDesktopCapturer* secondary_capturer_ = nullptr;
+  std::unique_ptr<FallbackDesktopCapturerWrapper> wrapper_;
+
+ private:
+  // DesktopCapturer::Callback interface
+  void OnCaptureResult(DesktopCapturer::Result result,
+                       std::unique_ptr<DesktopFrame> frame) override;
+  PainterDesktopFrameGenerator frame_generator;
+};
+
+FallbackDesktopCapturerWrapperTest::FallbackDesktopCapturerWrapperTest() {
+  frame_generator.size()->set(1024, 768);
+  std::unique_ptr<DesktopCapturer> main_capturer =
+      CreateDesktopCapturer(&frame_generator);
+  std::unique_ptr<DesktopCapturer> secondary_capturer =
+      CreateDesktopCapturer(&frame_generator);
+  main_capturer_ = static_cast<FakeDesktopCapturer*>(main_capturer.get());
+  secondary_capturer_ =
+      static_cast<FakeDesktopCapturer*>(secondary_capturer.get());
+  wrapper_.reset(new FallbackDesktopCapturerWrapper(
+      std::move(main_capturer), std::move(secondary_capturer)));
+  wrapper_->Start(this);
+}
+
+void FallbackDesktopCapturerWrapperTest::OnCaptureResult(
+    DesktopCapturer::Result result,
+    std::unique_ptr<DesktopFrame> frame) {
+  results_.emplace_back(result, !!frame);
+}
+
+TEST_F(FallbackDesktopCapturerWrapperTest, MainNeverFailed) {
+  wrapper_->CaptureFrame();
+  ASSERT_EQ(main_capturer_->num_capture_attempts(), 1);
+  ASSERT_EQ(main_capturer_->num_frames_captured(), 1);
+  ASSERT_EQ(secondary_capturer_->num_capture_attempts(), 0);
+  ASSERT_EQ(secondary_capturer_->num_frames_captured(), 0);
+  ASSERT_EQ(results_.size(), 1U);
+  ASSERT_EQ(results_[0],
+            std::make_pair(DesktopCapturer::Result::SUCCESS, true));
+}
+
+TEST_F(FallbackDesktopCapturerWrapperTest, MainFailedTemporarily) {
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::ERROR_TEMPORARY);
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::SUCCESS);
+  wrapper_->CaptureFrame();
+
+  ASSERT_EQ(main_capturer_->num_capture_attempts(), 3);
+  ASSERT_EQ(main_capturer_->num_frames_captured(), 2);
+  ASSERT_EQ(secondary_capturer_->num_capture_attempts(), 1);
+  ASSERT_EQ(secondary_capturer_->num_frames_captured(), 1);
+  ASSERT_EQ(results_.size(), 3U);
+  for (int i = 0; i < 3; i++) {
+    ASSERT_EQ(results_[i],
+              std::make_pair(DesktopCapturer::Result::SUCCESS, true));
+  }
+}
+
+TEST_F(FallbackDesktopCapturerWrapperTest, MainFailedPermanently) {
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::ERROR_PERMANENT);
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::SUCCESS);
+  wrapper_->CaptureFrame();
+
+  ASSERT_EQ(main_capturer_->num_capture_attempts(), 2);
+  ASSERT_EQ(main_capturer_->num_frames_captured(), 1);
+  ASSERT_EQ(secondary_capturer_->num_capture_attempts(), 2);
+  ASSERT_EQ(secondary_capturer_->num_frames_captured(), 2);
+  ASSERT_EQ(results_.size(), 3U);
+  for (int i = 0; i < 3; i++) {
+    ASSERT_EQ(results_[i],
+              std::make_pair(DesktopCapturer::Result::SUCCESS, true));
+  }
+}
+
+TEST_F(FallbackDesktopCapturerWrapperTest, BothFailed) {
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::ERROR_PERMANENT);
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::SUCCESS);
+  wrapper_->CaptureFrame();
+  secondary_capturer_->set_result(DesktopCapturer::Result::ERROR_TEMPORARY);
+  wrapper_->CaptureFrame();
+  secondary_capturer_->set_result(DesktopCapturer::Result::ERROR_PERMANENT);
+  wrapper_->CaptureFrame();
+  wrapper_->CaptureFrame();
+
+  ASSERT_EQ(main_capturer_->num_capture_attempts(), 2);
+  ASSERT_EQ(main_capturer_->num_frames_captured(), 1);
+  ASSERT_EQ(secondary_capturer_->num_capture_attempts(), 5);
+  ASSERT_EQ(secondary_capturer_->num_frames_captured(), 2);
+  ASSERT_EQ(results_.size(), 6U);
+  for (int i = 0; i < 3; i++) {
+    ASSERT_EQ(results_[i],
+              std::make_pair(DesktopCapturer::Result::SUCCESS, true));
+  }
+  ASSERT_EQ(results_[3],
+            std::make_pair(DesktopCapturer::Result::ERROR_TEMPORARY, false));
+  ASSERT_EQ(results_[4],
+            std::make_pair(DesktopCapturer::Result::ERROR_PERMANENT, false));
+  ASSERT_EQ(results_[5],
+            std::make_pair(DesktopCapturer::Result::ERROR_PERMANENT, false));
+}
+
+TEST_F(FallbackDesktopCapturerWrapperTest, WithSharedMemory) {
+  wrapper_->SetSharedMemoryFactory(std::unique_ptr<SharedMemoryFactory>(
+      new FakeSharedMemoryFactory()));
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::ERROR_TEMPORARY);
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::SUCCESS);
+  wrapper_->CaptureFrame();
+  main_capturer_->set_result(DesktopCapturer::Result::ERROR_PERMANENT);
+  wrapper_->CaptureFrame();
+  wrapper_->CaptureFrame();
+
+  ASSERT_EQ(main_capturer_->num_capture_attempts(), 4);
+  ASSERT_EQ(main_capturer_->num_frames_captured(), 2);
+  ASSERT_EQ(secondary_capturer_->num_capture_attempts(), 3);
+  ASSERT_EQ(secondary_capturer_->num_frames_captured(), 3);
+  ASSERT_EQ(results_.size(), 5U);
+  for (int i = 0; i < 5; i++) {
+    ASSERT_EQ(results_[i],
+              std::make_pair(DesktopCapturer::Result::SUCCESS, true));
+  }
+}
+
+}  // namespace webrtc
diff --git a/webrtc/modules/desktop_capture/shared_memory.h b/webrtc/modules/desktop_capture/shared_memory.h
index 6e15f23f6b..e654d95f2d 100644
--- a/webrtc/modules/desktop_capture/shared_memory.h
+++ b/webrtc/modules/desktop_capture/shared_memory.h
@@ -20,6 +20,7 @@
 #include <memory>
 
 #include "webrtc/base/constructormagic.h"
+#include "webrtc/base/thread_checker.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {