Fix race in HostSharedBitmapManager::AllocatedBitmapCount

content/common/host_shared_bitmap_manager.cc

Index: content/common/host_shared_bitmap_manager.cc
diff --git a/content/common/host_shared_bitmap_manager.cc b/content/common/host_shared_bitmap_manager.cc
index ac1478fe5ea07dc244ff178382418e611bfcd95d..66f721552f95614cd78cc23ccd230da16de6e7fe 100644
--- a/content/common/host_shared_bitmap_manager.cc
+++ b/content/common/host_shared_bitmap_manager.cc
@@ -187,6 +187,11 @@ void HostSharedBitmapManager::ProcessRemoved(
   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_);