mojo: Add proper implementation of DetachFromClient to OutputSurfaceMojo.

mojo/cc/output_surface_mojo.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/cc/output_surface_mojo.h"
 
 #include "base/bind.h"
 #include "cc/output/compositor_frame.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "cc/output/output_surface_client.h"
@@ skipping 12 matching lines @@
 
 OutputSurfaceMojo::~OutputSurfaceMojo() {
 }
 
 bool OutputSurfaceMojo::BindToClient(cc::OutputSurfaceClient* client) {
   surface_->BindToThread();
   surface_->set_client(this);
   return cc::OutputSurface::BindToClient(client);
 }
 
+void OutputSurfaceMojo::DetachFromClient() {
+  surface_.reset();
+  cc::OutputSurface::DetachFromClient();
+}
+
 void OutputSurfaceMojo::SwapBuffers(cc::CompositorFrame* frame) {
   // TODO(fsamuel, rjkroege): We should probably throttle compositor frames.
   client_->DidSwapBuffers();
   // OutputSurfaceMojo owns ViewSurface, and so if OutputSurfaceMojo is
   // destroyed then SubmitCompositorFrame's callback will never get called.
   // Thus, base::Unretained is safe here.
   surface_->SubmitCompositorFrame(
       mojo::CompositorFrame::From(*frame),
       base::Bind(&OutputSurfaceMojo::SwapBuffersComplete,
                  base::Unretained(this)));
 }
 
 void OutputSurfaceMojo::OnResourcesReturned(
     mus::ViewSurface* surface,
     mojo::Array<mojo::ReturnedResourcePtr> resources) {
   cc::CompositorFrameAck cfa;
   cfa.resources = resources.To<cc::ReturnedResourceArray>();
   ReclaimResources(&cfa);
 }
 
 void OutputSurfaceMojo::SwapBuffersComplete() {
   client_->DidSwapBuffersComplete();
 }
 
 }  // namespace mojo