cc: Add ScopedReadLockGpuMemoryBuffer

cc/test/test_gpu_memory_buffer_manager.h

Index: cc/test/test_gpu_memory_buffer_manager.h
diff --git a/cc/test/test_gpu_memory_buffer_manager.h b/cc/test/test_gpu_memory_buffer_manager.h
index 82e2ef326859c092107419252f3a0c03943d096d..ef2d0735ff367ee60422844ef4648f2f942cb175 100644
--- a/cc/test/test_gpu_memory_buffer_manager.h
+++ b/cc/test/test_gpu_memory_buffer_manager.h
@@ -17,10 +17,16 @@ class TestGpuMemoryBufferManager : public gpu::GpuMemoryBufferManager {
   TestGpuMemoryBufferManager();
   ~TestGpuMemoryBufferManager() override;
 
+  std::unique_ptr<TestGpuMemoryBufferManager>
+  CreateClientGpuMemoryBufferManager();
+  int GetClientId() { return client_id_; }
+
   void SetGpuMemoryBufferIsInUseByMacOSWindowServer(
       gfx::GpuMemoryBuffer* gpu_memory_buffer,
       bool in_use);
 
+  void OnGpuMemoryBufferDestroyed(gfx::GpuMemoryBufferId gpu_memory_buffer_id);
+
   // Overridden from gpu::GpuMemoryBufferManager:
   std::unique_ptr<gfx::GpuMemoryBuffer> AllocateGpuMemoryBuffer(
       const gfx::Size& size,
@@ -40,6 +46,18 @@ class TestGpuMemoryBufferManager : public gpu::GpuMemoryBufferManager {
                                const gpu::SyncToken& sync_token) override;
 
  private:
+  // Buffers allocated by this manager.
+  int last_gpu_memory_buffer_id_ = 1000;
+  std::map<int, gfx::GpuMemoryBuffer*> buffers_;
+
+  // Parent information for child managers.
+  int client_id_ = -1;
+  TestGpuMemoryBufferManager* parent_gpu_memory_buffer_manager_ = nullptr;
+
+  // Child infomration for parent managers.
+  int last_client_id_ = 5000;
+  std::map<int, TestGpuMemoryBufferManager*> clients_;
+
   DISALLOW_COPY_AND_ASSIGN(TestGpuMemoryBufferManager);
 };