Fix race in HostSharedBitmapManager::AllocatedBitmapCount

content/common/host_shared_bitmap_manager.cc

 // Copyright 2013 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/common/host_shared_bitmap_manager.h"
 
 #include "base/lazy_instance.h"
 #include "base/memory/ref_counted.h"
 #include "content/common/view_messages.h"
 #include "ui/gfx/size.h"
@@ skipping 169 matching lines @@
   base::hash_set<cc::SharedBitmapId>& res = proc_it->second;
 
   for (base::hash_set<cc::SharedBitmapId>::iterator it = res.begin();
        it != res.end();
        ++it) {
     handle_map_.erase(*it);
   }
   process_map_.erase(proc_it);
 }
 
+size_t HostSharedBitmapManager::AllocatedBitmapCount() const {
+  base::AutoLock lock(lock_);
+  return handle_map_.size();
+}
+
 void HostSharedBitmapManager::FreeSharedMemoryFromMap(
     cc::SharedBitmap* bitmap) {
   base::AutoLock lock(lock_);
   handle_map_.erase(bitmap->id());
 }
 
 }  // namespace content