Define MockTransformableFrame in test/.

The mock is to be used in frame transformer unit tests.

Bug: webrtc:11380
Change-Id: Id3f6ec71712333232873d8de30e3c7392dc7f5e3
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/174002
Commit-Queue: Marina Ciocea <marinaciocea@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31155}

test/BUILD.gn

@@ -883,6 +883,18 @@ rtc_library("mock_frame_transformer") {
   ]
 }
 
+rtc_library("mock_transformable_frame") {
+  visibility = [ "*" ]
+
+  testonly = true
+  sources = [ "mock_transformable_frame.h" ]
+
+  deps = [
+    "../api:frame_transformer_interface",
+    "../test:test_support",
+  ]
+}
+
 if (is_mac) {
   rtc_library("test_renderer_objc") {
     testonly = true

test/mock_transformable_frame.h

@@ -0,0 +1,29 @@
+/*
+ *  Copyright (c) 2020 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 TEST_MOCK_TRANSFORMABLE_FRAME_H_
+#define TEST_MOCK_TRANSFORMABLE_FRAME_H_
+
+#include "api/frame_transformer_interface.h"
+#include "test/gmock.h"
+
+namespace webrtc {
+
+class MockTransformableFrame : public TransformableFrameInterface {
+ public:
+  MOCK_METHOD(rtc::ArrayView<const uint8_t>, GetData, (), (const, override));
+  MOCK_METHOD(void, SetData, (rtc::ArrayView<const uint8_t>), (override));
+  MOCK_METHOD(uint32_t, GetTimestamp, (), (const, override));
+  MOCK_METHOD(uint32_t, GetSsrc, (), (const, override));
+};
+
+}  // namespace webrtc
+
+#endif  // TEST_MOCK_TRANSFORMABLE_FRAME_H_