webgl: optimize webgl.texSubImage2D(video) path.

content/renderer/media/webmediaplayer_ms.h

 // Copyright 2013 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 CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_
 #define CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ skipping 99 matching lines @@
   virtual bool hasSingleSecurityOrigin() const;
   virtual bool didPassCORSAccessCheck() const;
 
   virtual double mediaTimeForTimeValue(double timeValue) const;
 
   virtual unsigned decodedFrameCount() const;
   virtual unsigned droppedFrameCount() const;
   virtual unsigned audioDecodedByteCount() const;
   virtual unsigned videoDecodedByteCount() const;
 
-  bool copyVideoTextureToPlatformTexture(
+  // TODO(dshwang): remove it. virtual trick allows to remove it in blink.
+  // crbug.com/504773
+  virtual bool copyVideoTextureToPlatformTexture(
       blink::WebGraphicsContext3D* web_graphics_context,
       unsigned int texture,
       unsigned int internal_format,
       unsigned int type,
       bool premultiply_alpha,
+      bool flip_y);
+
+  bool copyVideoTextureToPlatformTexture(
+      blink::WebGraphicsContext3D* web_graphics_context,
+      unsigned int target,
+      unsigned int texture,
+      unsigned int internal_format,
+      unsigned int type,
+      int level,
+      bool premultiply_alpha,
+      bool flip_y) override;
+  bool copyVideoSubTextureToPlatformTexture(
+      blink::WebGraphicsContext3D* web_graphics_context,
+      unsigned int target,
+      unsigned int texture,
+      int level,
+      int xoffset,
+      int yoffset,
+      bool premultiply_alpha,
       bool flip_y) override;
 
   // VideoFrameProvider implementation.
   void SetVideoFrameProviderClient(
       cc::VideoFrameProvider::Client* client) override;
   bool UpdateCurrentFrame(base::TimeTicks deadline_min,
                           base::TimeTicks deadline_max) override;
   bool HasCurrentFrame() override;
   scoped_refptr<media::VideoFrame> GetCurrentFrame() override;
   void PutCurrentFrame() override;
@@ skipping 65 matching lines @@
 
   // Used for DCHECKs to ensure methods calls executed in the correct thread.
   base::ThreadChecker thread_checker_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerMS);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBMEDIAPLAYER_MS_H_