Mojo: request/response bindings

mojo/services/gles2/command_buffer_impl.cc

Index: mojo/services/gles2/command_buffer_impl.cc
diff --git a/mojo/services/gles2/command_buffer_impl.cc b/mojo/services/gles2/command_buffer_impl.cc
index e19ca7c0adab6f9eb1ddef046492afc7f0c112c7..7a897ffe2805341c57ca4f0d9355f54767daaa47 100644
--- a/mojo/services/gles2/command_buffer_impl.cc
+++ b/mojo/services/gles2/command_buffer_impl.cc
@@ -152,7 +152,9 @@ void CommandBufferImpl::DestroyTransferBuffer(int32_t id) {
   command_buffer_->DestroyTransferBuffer(id);
 }
 
-void CommandBufferImpl::Echo() { client_->EchoAck(); }
+void CommandBufferImpl::Echo(const Callback<void()>& callback) {
+  callback.Run();
+}
 
 void CommandBufferImpl::RequestAnimationFrames() {
   timer_.Start(FROM_HERE,