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

cc/trees/layer_tree_host_unittest.cc

 // 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.
 
 #include "cc/trees/layer_tree_host.h"
 
 #include <algorithm>
 
 #include "base/auto_reset.h"
 #include "base/synchronization/lock.h"
@@ skipping 1218 matching lines @@
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostTestSetVisible);
 
 class TestOpacityChangeLayerDelegate : public ContentLayerClient {
  public:
   TestOpacityChangeLayerDelegate() : test_layer_(0) {}
 
   void SetTestLayer(Layer* test_layer) { test_layer_ = test_layer; }
 
-  virtual void PaintContents(SkCanvas*, gfx::Rect, gfx::RectF*) OVERRIDE {
+  virtual void PaintContents(SkCanvas*, const gfx::Rect&,
+                             gfx::RectF*) OVERRIDE {
     // Set layer opacity to 0.
     if (test_layer_)
       test_layer_->SetOpacity(0.f);
   }
   virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
 
  private:
   Layer* test_layer_;
 };
 
@@ skipping 1256 matching lines @@
   class NotificationClient : public ContentLayerClient {
    public:
     NotificationClient()
         : layer_(0), paint_count_(0), lcd_notification_count_(0) {}
 
     void set_layer(Layer* layer) { layer_ = layer; }
     int paint_count() const { return paint_count_; }
     int lcd_notification_count() const { return lcd_notification_count_; }
 
     virtual void PaintContents(SkCanvas* canvas,
-                               gfx::Rect clip,
+                               const gfx::Rect& clip,
                                gfx::RectF* opaque) OVERRIDE {
       ++paint_count_;
     }
     virtual void DidChangeLayerCanUseLCDText() OVERRIDE {
       ++lcd_notification_count_;
       layer_->SetNeedsDisplay();
     }
 
    private:
     Layer* layer_;
@@ skipping 222 matching lines @@
 class LayerTreeHostTestChangeLayerPropertiesInPaintContents
     : public LayerTreeHostTest {
  public:
   class SetBoundsClient : public ContentLayerClient {
    public:
     SetBoundsClient() : layer_(0) {}
 
     void set_layer(Layer* layer) { layer_ = layer; }
 
     virtual void PaintContents(SkCanvas* canvas,
-                               gfx::Rect clip,
+                               const gfx::Rect& clip,
                                gfx::RectF* opaque) OVERRIDE {
       layer_->SetBounds(gfx::Size(2, 2));
     }
 
     virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
 
    private:
     Layer* layer_;
   };
 
@@ skipping 1996 matching lines @@
 
     EndTest();
   }
 
   virtual void AfterTest() OVERRIDE {}
 };
 
 MULTI_THREAD_TEST_F(LayerTreeHostTestSimpleSwapPromiseMonitor);
 
 }  // namespace cc