webgl: optimize webgl.texSubImage2D(video) path.

media/blink/webmediaplayer_impl.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 MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 #define MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 117 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;
 
   virtual blink::WebAudioSourceProvider* audioSourceProvider();
 
   virtual MediaKeyException generateKeyRequest(
       const blink::WebString& key_system,
       const unsigned char* init_data,
       unsigned init_data_length);
 
   virtual MediaKeyException addKey(const blink::WebString& key_system,
@@ skipping 177 matching lines @@
   scoped_ptr<blink::WebContentDecryptionModuleResult> set_cdm_result_;
 
   scoped_ptr<RendererFactory> renderer_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebMediaPlayerImpl);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BLINK_WEBMEDIAPLAYER_IMPL_H_