[#2] Pass gfx structs by const ref (gfx::Rect, gfx::RectF)

cc/test/fake_layer_tree_host_impl_client.h

 // Copyright 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.
 
 #ifndef CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_
 #define CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_
 
 #include "cc/output/begin_frame_args.h"
 #include "cc/trees/layer_tree_host_impl.h"
 
 namespace cc {
 
 class FakeLayerTreeHostImplClient : public LayerTreeHostImplClient {
  public:
   // LayerTreeHostImplClient implementation.
   virtual void DidLoseOutputSurfaceOnImplThread() OVERRIDE {}
   virtual void DidSwapBuffersOnImplThread() OVERRIDE {}
   virtual void OnSwapBuffersCompleteOnImplThread() OVERRIDE {}
   virtual void BeginImplFrame(const BeginFrameArgs& args)
       OVERRIDE {}
   virtual void OnCanDrawStateChanged(bool can_draw) OVERRIDE {}
   virtual void NotifyReadyToActivate() OVERRIDE {}
   virtual void SetNeedsRedrawOnImplThread() OVERRIDE {}
-  virtual void SetNeedsRedrawRectOnImplThread(gfx::Rect damage_rect) OVERRIDE {}
+  virtual void SetNeedsRedrawRectOnImplThread(
+    const gfx::Rect& damage_rect) OVERRIDE {}
   virtual void DidInitializeVisibleTileOnImplThread() OVERRIDE {}
   virtual void SetNeedsCommitOnImplThread() OVERRIDE {}
   virtual void SetNeedsManageTilesOnImplThread() OVERRIDE {}
   virtual void PostAnimationEventsToMainThreadOnImplThread(
       scoped_ptr<AnimationEventsVector> events,
       base::Time wall_clock_time) OVERRIDE {}
   virtual bool ReduceContentsTextureMemoryOnImplThread(
       size_t limit_bytes,
       int priority_cutoff) OVERRIDE;
   virtual void SendManagedMemoryStats() OVERRIDE {}
   virtual bool IsInsideDraw() OVERRIDE;
   virtual void RenewTreePriority() OVERRIDE {}
   virtual void RequestScrollbarAnimationOnImplThread(base::TimeDelta)
       OVERRIDE {}
   virtual void DidActivatePendingTree() OVERRIDE {}
   virtual void DidManageTiles() OVERRIDE {}
 };
 
 }  // namespace cc
 
 #endif  // CC_TEST_FAKE_LAYER_TREE_HOST_IMPL_CLIENT_H_