Re-land: content: Single process support for native GpuMemoryBuffers.

content/browser/gpu/browser_gpu_channel_host_factory.cc

 // Copyright (c) 2012 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 "content/browser/gpu/browser_gpu_channel_host_factory.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/profiler/scoped_tracker.h"
@@ skipping 226 matching lines @@
 
 void BrowserGpuChannelHostFactory::Terminate() {
   DCHECK(instance_);
   delete instance_;
   instance_ = NULL;
 }
 
 // static
 void BrowserGpuChannelHostFactory::EnableGpuMemoryBufferFactoryUsage(
     gfx::GpuMemoryBuffer::Usage usage) {
+  DCHECK_EQ(g_enabled_gpu_memory_buffer_usages.Get().count(usage), 0u);
   g_enabled_gpu_memory_buffer_usages.Get().insert(usage);
 }
 
 // static
 bool BrowserGpuChannelHostFactory::IsGpuMemoryBufferFactoryUsageEnabled(
     gfx::GpuMemoryBuffer::Usage usage) {
   return g_enabled_gpu_memory_buffer_usages.Get().count(usage) != 0;
 }
 
 // static
@@ skipping 302 matching lines @@
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   CreateGpuMemoryBufferCallbackMap::iterator iter =
       create_gpu_memory_buffer_requests_.find(request_id);
   DCHECK(iter != create_gpu_memory_buffer_requests_.end());
   iter->second.Run(handle);
   create_gpu_memory_buffer_requests_.erase(iter);
 }
 
 }  // namespace content