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

cc/resources/tile_manager.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/tile_manager.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 796 matching lines @@
   // of this could be that this tile is no longer allowed to use gpu
   // memory and in that case we need to abort initialization and free all
   // associated resources before calling DispatchMoreTasks().
   if (manage_tiles_call_count_when_dispatched != manage_tiles_call_count_)
     AssignGpuMemoryToTiles();
 
   ManagedTileState& managed_tile_state = tile->managed_state();
 
   // Finish resource initialization if |can_use_gpu_memory| is true.
   if (managed_tile_state.can_use_gpu_memory) {
-
     // Tile resources can't be freed until upload has completed.
     tile->drawing_info().can_be_freed_ = false;
 
     resource_pool_->resource_provider()->BeginSetPixels(resource->id());
     has_performed_uploads_since_last_flush_ = true;
 
     tile->drawing_info().resource_ = resource.Pass();
 
     bytes_pending_upload_ += tile->bytes_consumed_if_allocated();
     tiles_with_pending_upload_.push(tile);
@@ skipping 13 matching lines @@
 void TileManager::DidTileTreeBinChange(Tile* tile,
                                        TileManagerBin new_tree_bin,
                                        WhichTree tree) {
   ManagedTileState& mts = tile->managed_state();
   mts.tree_bin[tree] = new_tree_bin;
 }
 
 // static
 void TileManager::RunRasterTask(
     uint8* buffer,
-    const gfx::Rect& rect,
+    gfx::Rect rect,
     float contents_scale,
     const RasterTaskMetadata& metadata,
     RenderingStatsInstrumentation* stats_instrumentation,
     PicturePileImpl* picture_pile) {
   TRACE_EVENT2(
       "cc", "TileManager::RunRasterTask",
       "is_on_pending_tree",
       metadata.is_tile_in_pending_tree_now_bin,
       "is_low_res",
       metadata.tile_resolution == LOW_RESOLUTION);
@@ skipping 114 matching lines @@
     skia::LazyPixelRef* pixel_ref,
     RenderingStatsInstrumentation* stats_instrumentation) {
   TRACE_EVENT0("cc", "TileManager::RunImageDecodeTask");
   base::TimeTicks start_time = stats_instrumentation->StartRecording();
   pixel_ref->Decode();
   base::TimeDelta duration = stats_instrumentation->EndRecording(start_time);
   stats_instrumentation->AddDeferredImageDecode(duration);
 }
 
 }  // namespace cc