cc: Don't pass simple well-defined classes by reference.

cc/test/layer_tree_test.h

 // Copyright 2011 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_LAYER_TREE_TEST_H_
 #define CC_TEST_LAYER_TREE_TEST_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/threading/thread.h"
 #include "cc/base/thread.h"
@@ skipping 93 matching lines @@
   virtual void SetupTree();
 
   void EndTest();
   void EndTestAfterDelay(int delay_milliseconds);
 
   void PostAddAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostAddInstantAnimationToMainThread(Layer* layer_to_receive_animation);
   void PostSetNeedsCommitToMainThread();
   void PostAcquireLayerTextures();
   void PostSetNeedsRedrawToMainThread();
-  void PostSetNeedsRedrawRectToMainThread(const gfx::Rect& damage_rect);
+  void PostSetNeedsRedrawRectToMainThread(gfx::Rect damage_rect);
   void PostSetVisibleToMainThread(bool visible);
 
   void DoBeginTest();
   void Timeout();
 
  protected:
   LayerTreeTest();
 
   virtual void InitializeSettings(LayerTreeSettings* settings) {}
 
   virtual void ScheduleComposite() OVERRIDE;
 
   void RealEndTest();
 
   virtual void DispatchAddInstantAnimation(Layer* layer_to_receive_animation);
   virtual void DispatchAddAnimation(Layer* layer_to_receive_animation);
   void DispatchSetNeedsCommit();
   void DispatchAcquireLayerTextures();
   void DispatchSetNeedsRedraw();
-  void DispatchSetNeedsRedrawRect(const gfx::Rect& damage_rect);
+  void DispatchSetNeedsRedrawRect(gfx::Rect damage_rect);
   void DispatchSetVisible(bool visible);
   void DispatchComposite();
   void DispatchDidAddAnimation();
 
   virtual void RunTest(bool threaded);
 
   Thread* ImplThread() { return proxy() ? proxy()->ImplThread() : NULL; }
   Proxy* proxy() const {
     return layer_tree_host_ ? layer_tree_host_->proxy() : NULL;
   }
@@ skipping 37 matching lines @@
   TEST_F(TEST_FIXTURE_NAME, RunMultiThread) {             \
     RunTest(true);                                        \
   }                                                       \
   class MultiThreadNeedsSemicolon##TEST_FIXTURE_NAME {}
 
 #define SINGLE_AND_MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME) \
   SINGLE_THREAD_TEST_F(TEST_FIXTURE_NAME);                \
   MULTI_THREAD_TEST_F(TEST_FIXTURE_NAME)
 
 #endif  // CC_TEST_LAYER_TREE_TEST_H_