Add WebGraphicsContext support for readbacks from any framebuffer.

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h

Index: content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
diff --git a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
index e538a4564e5863a12ac1aa3ffcb62af8c1a6da2e..bb99f732a7889566117119587d2e232730569b34 100644
--- a/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
+++ b/content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h
@@ -69,6 +69,8 @@ class WebGraphicsContext3DCommandBufferImpl
   virtual void reshape(int width, int height);
 
   virtual bool readBackFramebuffer(unsigned char* pixels, size_t buffer_size);
+  virtual bool readBackFramebuffer(unsigned char* pixels, int width, int height,
+                                   size_t buffer_size, WebGLId framebuffer);

[Ken Russell (switch to Gerrit), 2011/08/04 22:55:07]

I would have organized these arguments differently to keep the related ones
together. For example, pixels, buffer_size, framebuffer, width, height.

[jbauman, 2011/08/04 23:20:21]

Yeah, I guess that organization makes more sense. Fixed.

 
   virtual WebGLId getPlatformTextureId();
   virtual void prepareTexture();