Add cc::SharedBitmap::shared_memory_handle()

components/viz/display_compositor/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 "components/viz/display_compositor/host_shared_bitmap_manager.h"
 
 #include <stdint.h>
 
 #include <utility>
 
@@ skipping 33 matching lines @@
                    HostSharedBitmapManager* manager)
       : SharedBitmap(pixels, id),
         bitmap_data_(bitmap_data),
         manager_(manager) {}
 
   ~HostSharedBitmap() override {
     if (manager_)
       manager_->FreeSharedMemoryFromMap(id());
   }
 
+  // cc::SharedBitmap:
+  base::SharedMemoryHandle GetSharedMemoryHandle() const override {
+    if (!bitmap_data_->memory)
+      return base::SharedMemoryHandle();
+    return bitmap_data_->memory->handle();
+  }
+
  private:
   scoped_refptr<BitmapData> bitmap_data_;
   HostSharedBitmapManager* manager_;
 };
 
 }  // namespace
 
 base::LazyInstance<HostSharedBitmapManager>::DestructorAtExit
     g_shared_memory_manager = LAZY_INSTANCE_INITIALIZER;
 
@@ skipping 149 matching lines @@
   return handle_map_.size();
 }
 
 void HostSharedBitmapManager::FreeSharedMemoryFromMap(
     const cc::SharedBitmapId& id) {
   base::AutoLock lock(lock_);
   handle_map_.erase(id);
 }
 
 }  // namespace viz