Properly advertise GL_CHROMIUM_copy_texture_to_parent_texture extension....

chrome/renderer/webgraphicscontext3d_command_buffer_impl.h

Index: chrome/renderer/webgraphicscontext3d_command_buffer_impl.h
===================================================================
--- chrome/renderer/webgraphicscontext3d_command_buffer_impl.h	(revision 64864)
+++ chrome/renderer/webgraphicscontext3d_command_buffer_impl.h	(working copy)
@@ -340,9 +340,9 @@
   virtual void deleteTexture(unsigned);
 
   virtual void synthesizeGLError(unsigned long error);
-  virtual bool supportsBGRA();
+  virtual bool supportsBGRA();  // TODO(kbr): remove
 
-  virtual bool supportsMapSubCHROMIUM();
+  virtual bool supportsMapSubCHROMIUM();  // TODO(kbr): remove
   virtual void* mapBufferSubDataCHROMIUM(
       unsigned target, int offset, int size, unsigned access);
   virtual void unmapBufferSubDataCHROMIUM(const void*);
@@ -358,6 +358,7 @@
       unsigned access);
   virtual void unmapTexSubImage2DCHROMIUM(const void*);
 
+  // TODO(kbr): remove supportsCopyTextureToParentTextureCHROMIUM
   virtual bool supportsCopyTextureToParentTextureCHROMIUM();
   virtual void copyTextureToParentTextureCHROMIUM(
       unsigned texture, unsigned parentTexture);