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

cc/resources/raster_worker_pool.cc

 // Copyright 2013 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/raster_worker_pool.h"
 
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
 #include "base/values.h"
 #include "cc/debug/devtools_instrumentation.h"
@@ skipping 36 matching lines @@
 
     paint->setLCDRenderText(false);
     return true;
   }
 };
 
 class RasterWorkerPoolTaskImpl : public internal::RasterWorkerPoolTask {
  public:
   RasterWorkerPoolTaskImpl(const Resource* resource,
                            PicturePileImpl* picture_pile,
-                           gfx::Rect content_rect,
+                           const gfx::Rect& content_rect,
                            float contents_scale,
                            RasterMode raster_mode,
                            TileResolution tile_resolution,
                            int layer_id,
                            const void* tile_id,
                            int source_frame_number,
                            bool use_gpu_rasterization,
                            RenderingStatsInstrumentation* rendering_stats,
                            const RasterWorkerPool::RasterTask::Reply& reply,
                            TaskVector* dependencies)
@@ skipping 393 matching lines @@
   internal_ = NULL;
 }
 
 RasterWorkerPool::RasterTask::~RasterTask() {
 }
 
 // static
 RasterWorkerPool::RasterTask RasterWorkerPool::CreateRasterTask(
     const Resource* resource,
     PicturePileImpl* picture_pile,
-    gfx::Rect content_rect,
+    const gfx::Rect& content_rect,
     float contents_scale,
     RasterMode raster_mode,
     TileResolution tile_resolution,
     int layer_id,
     const void* tile_id,
     int source_frame_number,
     bool use_gpu_rasterization,
     RenderingStatsInstrumentation* rendering_stats,
     const RasterTask::Reply& reply,
     Task::Set* dependencies) {
@@ skipping 197 matching lines @@
 
     internal::GraphNode* decode_node = CreateGraphNodeForTask(
         decode_task, priority, graph);
     decode_node->add_dependent(raster_node);
   }
 
   return raster_node;
 }
 
 }  // namespace cc