Connect to DesktopEnvironment's stubs only when audio/video schedulers are about to be created.

remoting/capturer/video_frame_capturer_fake.h

Index: remoting/capturer/video_frame_capturer_fake.h
diff --git a/remoting/capturer/video_frame_capturer_fake.h b/remoting/capturer/video_frame_capturer_fake.h
index c3a818b457a56f7602324a3ff183a05865e46a30..0547796591a9681a3d4712a7441da4896f461d88 100644
--- a/remoting/capturer/video_frame_capturer_fake.h
+++ b/remoting/capturer/video_frame_capturer_fake.h
@@ -17,6 +17,10 @@ namespace remoting {
 // See remoting/host/video_frame_capturer.h.
 class VideoFrameCapturerFake : public VideoFrameCapturer {
  public:
+  // VideoFrameCapturerFake generates a picture of size kWidth x kHeight.
+  static const int kWidth = 800;
+  static const int kHeight = 600;
+
   VideoFrameCapturerFake();
   virtual ~VideoFrameCapturerFake();