Reland [Mojo Video Capture] Add test coverage for accelerated jpeg decoding

content/browser/renderer_host/media/video_capture_controller.h

Index: content/browser/renderer_host/media/video_capture_controller.h
diff --git a/content/browser/renderer_host/media/video_capture_controller.h b/content/browser/renderer_host/media/video_capture_controller.h
index b5f4a10f9d0e97c50e33c315fc4dc426cd921f77..0ba1cfb95041653499060596087836132428d2ec 100644
--- a/content/browser/renderer_host/media/video_capture_controller.h
+++ b/content/browser/renderer_host/media/video_capture_controller.h
@@ -102,6 +102,7 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
   void OnError() override;
   void OnLog(const std::string& message) override;
   void OnStarted() override;
+  void OnStartedUsingGpuDecode() override;
 
  private:
   struct ControllerClient;
@@ -172,6 +173,11 @@ class CONTENT_EXPORT VideoCaptureController : public media::VideoFrameReceiver {
   void ReleaseBufferContext(
       const std::vector<BufferContext>::iterator& buffer_state_iter);
 
+  using EventHandlerAction =
+      base::Callback<void(VideoCaptureControllerEventHandler* client,
+                          VideoCaptureControllerID id)>;
+  void PerformForClientsWithOpenSession(EventHandlerAction action);
+
   std::unique_ptr<media::VideoFrameConsumerFeedbackObserver>
       consumer_feedback_observer_;