content: Add GpuMemoryBuffer MemoryDumpProvider implementation.

content/browser/browser_process_sub_thread.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/browser_process_sub_thread.h"
 
 #include "base/debug/leak_tracker.h"
 #include "base/threading/thread_restrictions.h"
+#include "base/trace_event/memory_dump_manager.h"
 #include "build/build_config.h"
 #include "content/browser/browser_child_process_host_impl.h"
+#include "content/browser/gpu/browser_gpu_memory_buffer_manager.h"
 #include "content/browser/notification_service_impl.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_request.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
 #endif
 
 namespace content {
 
@@ skipping 42 matching lines @@
 
   // Destroy all URLRequests started by URLFetchers.
   net::URLFetcher::CancelAll();
 
 #if !defined(OS_IOS)
   // If any child processes are still running, terminate them and
   // and delete the BrowserChildProcessHost instances to release whatever
   // IO thread only resources they are referencing.
   BrowserChildProcessHostImpl::TerminateAll();
 #endif  // !defined(OS_IOS)
+
+  // Unregister GpuMemoryBuffer dump provider before IO thread is shut down.
+  base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
+      BrowserGpuMemoryBufferManager::current());
 }
 
 }  // namespace content