Implement TextureImageTransportSurface using texture mailbox

content/common/gpu/client/gl_helper.h

 // Copyright (c) 2012 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_COMMON_GPU_CLIENT_GL_HELPER_H_
 #define CONTENT_COMMON_GPU_CLIENT_GL_HELPER_H_
 
 #include "base/atomicops.h"
 #include "base/basictypes.h"
 #include "base/callback.h"
@@ skipping 35 matching lines @@
   // size of the texture.  No post processing is applied to the pixels.  The
   // texture is assumed to have a format of GL_RGBA with a pixel type of
   // GL_UNSIGNED_BYTE.  This is a blocking call that calls glReadPixels on this
   // current context.
   void ReadbackTextureSync(WebKit::WebGLId texture,
                            const gfx::Size& size,
                            unsigned char* out);
 
   // Creates a copy of the specified texture. |size| is the size of the texture.
   WebKit::WebGLId CopyTexture(WebKit::WebGLId texture,
-                              const gfx::Size& size);
+                              const gfx::Size& size,
+                              WebKit::WebGLId texture_out = 0);
 
   // Creates a scaled copy of the specified texture. |src_size| is the size of
   // the texture and |dst_size| is the size of the resulting copy.
   WebKit::WebGLId CopyAndScaleTexture(WebKit::WebGLId texture,
                                       const gfx::Size& src_size,
-                                      const gfx::Size& dst_size);
+                                      const gfx::Size& dst_size,
+                                      WebKit::WebGLId texture_out = 0);
 
   // Returns the shader compiled from the source.
   WebKit::WebGLId CompileShaderFromSource(const WebKit::WGC3Dchar* source,
                                           WebKit::WGC3Denum type);
 
  private:
   class CopyTextureToImpl;
 
   // Creates |copy_texture_to_impl_| if NULL.
   void InitCopyTextToImpl();
 
   WebKit::WebGraphicsContext3D* context_;
   WebKit::WebGraphicsContext3D* context_for_thread_;
   scoped_ptr<CopyTextureToImpl> copy_texture_to_impl_;
 
   // The number of all GLHelper instances.
   static base::subtle::Atomic32 count_;
 
   DISALLOW_COPY_AND_ASSIGN(GLHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GL_HELPER_H_