Move SurfaceTexture construction to BackingStrategy.

content/common/gpu/media/android_copying_backing_strategy.h

Index: content/common/gpu/media/android_copying_backing_strategy.h
diff --git a/content/common/gpu/media/android_copying_backing_strategy.h b/content/common/gpu/media/android_copying_backing_strategy.h
index 354dcfc03d732c73b4b18552c58c6a14ec22ffbf..7b2fa6590584a32c6fcd5df4df99f643dabd7828 100644
--- a/content/common/gpu/media/android_copying_backing_strategy.h
+++ b/content/common/gpu/media/android_copying_backing_strategy.h
@@ -35,15 +35,21 @@ class CONTENT_EXPORT AndroidCopyingBackingStrategy
   void Cleanup() override;
   uint32 GetNumPictureBuffers() const override;
   uint32 GetTextureTarget() const override;
-  void AssignCurrentSurfaceToPictureBuffer(
-      int32 codec_buffer_index,
-      const media::PictureBuffer&) override;
+  scoped_refptr<gfx::SurfaceTexture> CreateSurfaceTexture() override;
+  void UseCodecBufferForPictureBuffer(int32 codec_buffer_index,
+                                      const media::PictureBuffer&) override;
 
  private:
   // Used for copy the texture from surface texture to picture buffers.
   scoped_ptr<gpu::CopyTextureCHROMIUMResourceManager> copier_;
 
   AndroidVideoDecodeAcceleratorStateProvider* state_provider_;
+
+  // A container of texture. Used to set a texture to |media_codec_|.
+  scoped_refptr<gfx::SurfaceTexture> surface_texture_;
+
+  // The texture id which is set to |surface_texture_|.
+  uint32 surface_texture_id_;
 };
 
 }  // namespace content