Add GL_CHROMIUM_texture_mailbox entrypoints to wgc3d implementations

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h

Index: webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
diff --git a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
index eb31f8844247fa62f8e6b50a810a133f10e7c19c..7c0c3116857a8f34f6b8489be379465839539424 100644
--- a/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
+++ b/webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h
@@ -26,6 +26,7 @@ class GLES2Implementation;
 
 using WebKit::WebGLId;
 
+using WebKit::WGC3Dbyte;
 using WebKit::WGC3Dchar;
 using WebKit::WGC3Denum;
 using WebKit::WGC3Dboolean;
@@ -483,6 +484,12 @@ class WebGraphicsContext3DInProcessCommandBufferImpl
 
   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();