[Chromecast] Adding pause/resume operations to VideoPlaneController.

chromecast/media/base/video_plane_controller.h

Index: chromecast/media/base/video_plane_controller.h
diff --git a/chromecast/media/base/video_plane_controller.h b/chromecast/media/base/video_plane_controller.h
index 302c8fa4341c2f6a202244b34c5b203bdce4269f..98e79e0fb2d7221a4f01a9503febcbf1777ecd67 100644
--- a/chromecast/media/base/video_plane_controller.h
+++ b/chromecast/media/base/video_plane_controller.h
@@ -58,6 +58,21 @@ class VideoPlaneController {
   // no-op.
   void SetGraphicsPlaneResolution(const Size& resolution);
 
+  // After Pause is called, no further calls to VideoPlane::SetGeometry will be
+  // made except for any pending calls already scheduled on the media thread.
+  // The Set methods will however updated cached parameters that will take
+  // effect once the class is resumed. Safe to call multiple times.
+  void Pause();
+  // Makes class active again. Safe to call multiple times.
+  void Resume();
+  bool is_paused() const { return is_paused_; }
+
+  // Clears any cached geometry parameters or state so that next call to
+  // SetGeometry is guaranteed to trigger VideoPlane::SetGeometry (assuming
+  // resolutions have been set and class is active). Can be called in paused
+  // state.
+  void ClearGeometryState();
+
  private:
   class RateLimitedSetVideoPlaneGeometry;
   friend struct base::DefaultSingletonTraits<VideoPlaneController>;
@@ -73,6 +88,8 @@ class VideoPlaneController {
   // VideoPlane::SetGeometry.
   bool HaveDataForSetGeometry() const;
 
+  bool is_paused_;
+
   // Current resolutions
   bool have_output_res_;
   bool have_graphics_res_;