Add GL_CHROMIUM_texture_mailbox entrypoints to wgc3d implementations

content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h

Index: content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
diff --git a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
index 1ac84a243d18eea2de904436cae0c44e8b87821d..fd5dbbcc4f7b468503810702854a2342fd069899 100644
--- a/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
+++ b/content/common/gpu/client/webgraphicscontext3d_command_buffer_impl.h
@@ -41,6 +41,7 @@ class GLES2Implementation;
 
 using WebKit::WebGLId;
 
+using WebKit::WGC3Dbyte;
 using WebKit::WGC3Dchar;
 using WebKit::WGC3Denum;
 using WebKit::WGC3Dboolean;
@@ -247,7 +248,6 @@ class WebGraphicsContext3DCommandBufferImpl
   virtual void enableVertexAttribArray(WGC3Duint index);
   virtual void finish();
   virtual void flush();
-  virtual void shallowFlushCHROMIUM();
   virtual void framebufferRenderbuffer(WGC3Denum target,
                                        WGC3Denum attachment,
                                        WGC3Denum renderbuffertarget,
@@ -574,6 +574,14 @@ class WebGraphicsContext3DCommandBufferImpl
   virtual void bindUniformLocationCHROMIUM(WebGLId program, WGC3Dint location,
                                            const WGC3Dchar* uniform);
 
+  virtual void shallowFlushCHROMIUM();
+
+  virtual void genMailboxCHROMIUM(WGC3Dbyte* mailbox);
+  virtual void produceTextureCHROMIUM(WGC3Denum target,
+                                      const WGC3Dbyte* mailbox);
+  virtual void consumeTextureCHROMIUM(WGC3Denum target,
+                                      const WGC3Dbyte* mailbox);
+
  protected:
   virtual GrGLInterface* onCreateGrGLInterface();