diff --git a/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.cc b/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.cc
index 83e0fda5ff..0cefb86cdc 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.cc
+++ b/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.cc
@@ -25,22 +25,6 @@
 
 namespace webrtc {
 
-namespace {
-
-// TODO(zijiehe): This function should be public as
-// static bool DxgiDuplicatorController::IsSessionUnsupported()
-bool IsRunningInSession0() {
-  DWORD session_id = 0;
-  if (!::ProcessIdToSessionId(::GetCurrentProcessId(), &session_id)) {
-    LOG(LS_WARNING) << "Failed to retrieve current session Id, current binary "
-                       "may not have required priviledge.";
-    return true;
-  }
-  return session_id == 0;
-}
-
-}  // namespace
-
 // static
 rtc::scoped_refptr<DxgiDuplicatorController>
 DxgiDuplicatorController::Instance() {
@@ -50,6 +34,17 @@ DxgiDuplicatorController::Instance() {
   return rtc::scoped_refptr<DxgiDuplicatorController>(instance);
 }
 
+// static
+bool DxgiDuplicatorController::IsCurrentSessionSupported() {
+  DWORD session_id = 0;
+  if (!::ProcessIdToSessionId(::GetCurrentProcessId(), &session_id)) {
+    LOG(LS_WARNING) << "Failed to retrieve current session Id, current binary "
+                       "may not have required priviledge.";
+    return false;
+  }
+  return session_id != 0;
+}
+
 DxgiDuplicatorController::DxgiDuplicatorController()
     : refcount_(0) {}
 
@@ -148,7 +143,7 @@ DxgiDuplicatorController::DoDuplicate(DxgiFrame* frame, int monitor_id) {
   }
 
   if (!Initialize()) {
-    if (succeeded_duplications_ == 0 && IsRunningInSession0()) {
+    if (succeeded_duplications_ == 0 && !IsCurrentSessionSupported()) {
       LOG(LS_WARNING) << "Current binary is running in session 0. DXGI "
                          "components cannot be initialized.";
       return Result::UNSUPPORTED_SESSION;
diff --git a/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h b/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h
index 0b0990d73d..8ea7f183c2 100644
--- a/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h
+++ b/webrtc/modules/desktop_capture/win/dxgi_duplicator_controller.h
@@ -71,6 +71,9 @@ class DxgiDuplicatorController {
   // Returns the singleton instance of DxgiDuplicatorController.
   static rtc::scoped_refptr<DxgiDuplicatorController> Instance();
 
+  // See ScreenCapturerWinDirectx::IsCurrentSessionSupported().
+  static bool IsCurrentSessionSupported();
+
   // All the following public functions implicitly call Initialize() function.
 
   // Detects whether the system supports DXGI based capturer.
diff --git a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
index 74b7b4501a..722353e4f3 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.cc
@@ -36,6 +36,11 @@ bool ScreenCapturerWinDirectx::RetrieveD3dInfo(D3dInfo* info) {
   return DxgiDuplicatorController::Instance()->RetrieveD3dInfo(info);
 }
 
+// static
+bool ScreenCapturerWinDirectx::IsCurrentSessionSupported() {
+  return DxgiDuplicatorController::IsCurrentSessionSupported();
+}
+
 ScreenCapturerWinDirectx::ScreenCapturerWinDirectx()
     : controller_(DxgiDuplicatorController::Instance()) {}
 
diff --git a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
index 5064a9623b..f383303b5d 100644
--- a/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
+++ b/webrtc/modules/desktop_capture/win/screen_capturer_win_directx.h
@@ -44,6 +44,13 @@ class ScreenCapturerWinDirectx : public DesktopCapturer {
   // consumers should not cache the result returned by this function.
   static bool RetrieveD3dInfo(D3dInfo* info);
 
+  // Whether current process is running in a Windows session which is supported
+  // by ScreenCapturerWinDirectx.
+  // Usually using ScreenCapturerWinDirectx in unsupported sessions will fail.
+  // But this behavior may vary on different Windows version. So consumers can
+  // always try IsSupported() function.
+  static bool IsCurrentSessionSupported();
+
   explicit ScreenCapturerWinDirectx();
 
   ~ScreenCapturerWinDirectx() override;