[chromecast] Pass media task runner 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 c14ae95504f93ee72d7b7b2c7874f34f2154d0ac..7b20b4869bd7c57e496e40ff4d1b70a4a6658f13 100644
--- a/chromecast/media/base/video_plane_controller.h
+++ b/chromecast/media/base/video_plane_controller.h
@@ -36,8 +36,9 @@ namespace media {
 // All calls to public methods should be from the same thread.
 class VideoPlaneController {
  public:
-  static VideoPlaneController* GetInstance();
-
+  explicit VideoPlaneController(
+      scoped_refptr<base::SingleThreadTaskRunner> media_task_runner);
+  ~VideoPlaneController();
   // Sets the video plane geometry (forwards to VideoPlane::SetGeometry)
   // in *graphics plane coordinates*.
   //  * This should be called on UI thread (hopping to media thread is handled
@@ -77,9 +78,6 @@ class VideoPlaneController {
   class RateLimitedSetVideoPlaneGeometry;
   friend struct base::DefaultSingletonTraits<VideoPlaneController>;
 
-  VideoPlaneController();
-  ~VideoPlaneController();
-
   // Check if HaveDataForSetGeometry. If not, this method is a no-op. Otherwise
   // it scales the display rect from graphics to device resolution coordinates.
   // Then posts task to media thread for VideoPlane::SetGeometry.