[chromecast] Pass media task runner to VideoPlaneController.

chromecast/media/base/video_plane_controller.h

 // 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.
 
 #ifndef CHROMECAST_MEDIA_VIDEO_PLANE_CONTROLLER_H_
 #define CHROMECAST_MEDIA_VIDEO_PLANE_CONTROLLER_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/singleton.h"
@@ skipping 18 matching lines @@
 //   media thread with SetGeometry calls (which are expensive on many
 //   platforms).
 // The class collects/caches the data it needs before it can start operating.
 // This means SetGeometry, SetDeviceResolution, and SetGraphicsPlaneResolution
 // need to be called at least once in any order before the class starts making
 // calls to VideoPlane::SetGeometry. All calls to these methods beforehand just
 // set/update the cached parameters.
 // 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
   //    internally).
   // If there is no change to video plane parameters from the last call to this
   // method, it is a no-op.
   void SetGeometry(const RectF& display_rect, VideoPlane::Transform transform);
 
   // Sets physical screen resolution.  This must be called at least once when
   // the final output resolution (HDMI signal or panel resolution) is known,
@@ skipping 19 matching lines @@
   // Makes class active again. Also resets the video plane by posting a call to
   // VideoPlane::SetGeometry with most recent resolution and geometry parameters
   // (assuming they are all set). Safe to call multiple times.
   void Resume();
   bool is_paused() const;
 
  private:
   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.
   void MaybeRunSetGeometry();
   // Checks if all data has been collected to make calls to
   // VideoPlane::SetGeometry.
   bool HaveDataForSetGeometry() const;
 
   bool is_paused_;
 
@@ skipping 14 matching lines @@
 
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(VideoPlaneController);
 };
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_MEDIA_VIDEO_PLANE_CONTROLLER_H_