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

cc/resources/picture_pile.cc

 // 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.
 
 #include "cc/resources/picture_pile.h"
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 133 matching lines @@
 }
 
 PicturePile::~PicturePile() {
 }
 
 bool PicturePile::Update(
     ContentLayerClient* painter,
     SkColor background_color,
     bool contents_opaque,
     const Region& invalidation,
-    gfx::Rect visible_layer_rect,
+    const gfx::Rect& visible_layer_rect,
     int frame_number,
     RenderingStatsInstrumentation* stats_instrumentation) {
   background_color_ = background_color;
   contents_opaque_ = contents_opaque;
 
   gfx::Rect interest_rect = visible_layer_rect;
   interest_rect.Inset(
       -kPixelDistanceToRecord,
       -kPixelDistanceToRecord,
       -kPixelDistanceToRecord,
@@ skipping 81 matching lines @@
         info.SetPicture(picture);
       }
     }
   }
 
   UpdateRecordedRegion();
   return true;
 }
 
 }  // namespace cc