Cache gpu suitability in DisplayItemList, remove SetUnsuitable...ForTesting

cc/playback/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/playback/picture_pile.h"
 
 #include <algorithm>
 #include <limits>
 #include <vector>
 
@@ skipping 594 matching lines @@
   return is_suitable_for_gpu_rasterization_;
 }
 
 void PicturePile::SetTileGridSize(const gfx::Size& tile_grid_size) {
   DCHECK_GT(tile_grid_size.width(), 0);
   DCHECK_GT(tile_grid_size.height(), 0);
 
   tile_grid_size_ = tile_grid_size;
 }
 
-void PicturePile::SetUnsuitableForGpuRasterizationForTesting() {
-  is_suitable_for_gpu_rasterization_ = false;
-}
-
 bool PicturePile::CanRasterSlowTileCheck(const gfx::Rect& layer_rect) const {
   bool include_borders = false;
   for (TilingData::Iterator tile_iter(&tiling_, layer_rect, include_borders);
        tile_iter; ++tile_iter) {
     PictureMap::const_iterator map_iter = picture_map_.find(tile_iter.index());
     if (map_iter == picture_map_.end())
       return false;
   }
   return true;
 }
@@ skipping 52 matching lines @@
 
 void PicturePile::SetBufferPixels(int new_buffer_pixels) {
   if (new_buffer_pixels == buffer_pixels())
     return;
 
   Clear();
   tiling_.SetBorderTexels(new_buffer_pixels);
 }
 
 }  // namespace cc