cc: Remove low quality mode and cleanup tile versions.

cc/resources/picture_layer_tiling.h

 // 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.
 
 #ifndef CC_RESOURCES_PICTURE_LAYER_TILING_H_
 #define CC_RESOURCES_PICTURE_LAYER_TILING_H_
 
 #include <set>
 #include <utility>
 #include <vector>
@@ skipping 83 matching lines @@
    private:
     enum Phase {
       VISIBLE_RECT,
       SKEWPORT_RECT,
       SOON_BORDER_RECT,
       EVENTUALLY_RECT
     };
 
     void AdvancePhase();
     bool TileNeedsRaster(Tile* tile) const {
-      RasterMode mode = tile->DetermineRasterModeForTree(tree_);
-      return !tile->is_occluded(tree_) && tile->NeedsRasterForMode(mode);
+      return !tile->is_occluded(tree_) && !tile->IsReadyToDraw();
     }
 
     PictureLayerTiling* tiling_;
 
     Phase phase_;
     WhichTree tree_;
 
     Tile* current_tile_;
     TilingData::Iterator visible_iterator_;
     TilingData::SpiralDifferenceIterator spiral_iterator_;
@@ skipping 241 matching lines @@
 
  private:
   DISALLOW_ASSIGN(PictureLayerTiling);
 
   RectExpansionCache expansion_cache_;
 };
 
 }  // namespace cc
 
 #endif  // CC_RESOURCES_PICTURE_LAYER_TILING_H_