Extend components/test_runner's generated WebMediaStream to have a ChromeMock VideoTrack and Source

components/test_runner/renderer/mock_video_capturer_source.cc

Index: components/test_runner/renderer/mock_video_capturer_source.cc
diff --git a/components/test_runner/renderer/mock_video_capturer_source.cc b/components/test_runner/renderer/mock_video_capturer_source.cc
new file mode 100644
index 0000000000000000000000000000000000000000..5b4962f01efb79876f3f43b3c9eb324f17e30d79
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+++ b/components/test_runner/renderer/mock_video_capturer_source.cc
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+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "components/test_runner/renderer/mock_video_capturer_source.h"
+
+#if defined(ENABLE_WEBRTC)
+
+#include "content/public/renderer/media_stream_api.h"
+
+#else
+
+#include "third_party/WebKit/public/platform/WebMediaStream.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamSource.h"
+#include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
+#include "third_party/WebKit/public/platform/WebString.h"
+
+#endif
+
+#if defined(ENABLE_WEBRTC)
+
+namespace {
+
+class MockVideoCapturerSource : public media::VideoCapturerSource {
+ public:
+  MockVideoCapturerSource() = default;
+  ~MockVideoCapturerSource() override {}
+
+  void GetCurrentSupportedFormats(
+      int max_requested_width,
+      int max_requested_height,
+      double max_requested_frame_rate,
+      const VideoCaptureDeviceFormatsCB& callback) override {}
+  void StartCapture(
+      const media::VideoCaptureParams& params,
+      const VideoCaptureDeliverFrameCB& new_frame_callback,
+      const RunningCallback& running_callback) override {}
+  void StopCapture() override {}
+};
+
+}  // namespace anonymous
+
+#endif
+
+namespace test_runner {
+
+void AddVideoTrackToMediaStream(blink::WebMediaStream* stream) {
+#if defined(ENABLE_WEBRTC)
+  content::AddVideoTrackToMediaStream(
+      make_scoped_ptr(new MockVideoCapturerSource()),
+      false /*is _remote */,
+      true /* is_readonly */,
+      stream);
+#else
+  blink::WebMediaStreamSource source;
+  source.initialize("MockVideoDevice#1",
+                    blink::WebMediaStreamSource::TypeVideo,
+                    "Mock video device",
+                    false /* remote */,
+                    true /* readonly */);
+  blink::WebMediaStreamTrack web_track;
+  web_track.initialize(source);
+  stream->addTrack(web_track);
+#endif
+}
+
+}  // namespace test_runner