Ensure SurfaceManager is only ever used from one thread.

cc/surfaces/surface_manager.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 "cc/surfaces/surface_manager.h"
 
 #include "base/logging.h"
 #include "cc/surfaces/surface.h"
 
 namespace cc {
 
 SurfaceManager::SurfaceManager() {
+  thread_checker_.DetachFromThread();
 }
 
 SurfaceManager::~SurfaceManager() {
+  DCHECK(thread_checker_.CalledOnValidThread());
 }
 
 void SurfaceManager::RegisterSurface(Surface* surface) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(surface);
   DCHECK(!surface_map_.count(surface->surface_id()));
   surface_map_[surface->surface_id()] = surface;
 }
 
 void SurfaceManager::DeregisterSurface(SurfaceId surface_id) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   SurfaceMap::iterator it = surface_map_.find(surface_id);
   DCHECK(it != surface_map_.end());
   surface_map_.erase(it);
 }
 
 Surface* SurfaceManager::GetSurfaceForId(SurfaceId surface_id) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   SurfaceMap::iterator it = surface_map_.find(surface_id);
   if (it == surface_map_.end())
     return NULL;
   return it->second;
 }
 
 void SurfaceManager::SurfaceModified(SurfaceId surface_id) {
+  DCHECK(thread_checker_.CalledOnValidThread());
   FOR_EACH_OBSERVER(
       SurfaceDamageObserver, observer_list_, OnSurfaceDamaged(surface_id));
 }
 
 }  // namespace cc