cc: Disable low res in non-smoothness mode.

cc/layers/picture_layer_impl.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/layers/picture_layer_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <set>
 
@@ skipping 1432 matching lines @@
   }
 
   // Find high and low res tilings and initialize the iterators.
   for (size_t i = 0; i < layer_->tilings_->num_tilings(); ++i) {
     PictureLayerTiling* tiling = layer_->tilings_->tiling_at(i);
     if (tiling->resolution() == HIGH_RESOLUTION) {
       iterators_[HIGH_RES] =
           PictureLayerTiling::TilingRasterTileIterator(tiling);
     }
 
-    if (tiling->resolution() == LOW_RESOLUTION) {
+    if (prioritize_low_res && tiling->resolution() == LOW_RESOLUTION) {
       iterators_[LOW_RES] =
           PictureLayerTiling::TilingRasterTileIterator(tiling);
     }
   }
 
   if (prioritize_low_res) {
     stages_[0].iterator_type = LOW_RES;
     stages_[0].tile_type = TilePriority::NOW;
 
     stages_[1].iterator_type = HIGH_RES;
@@ skipping 221 matching lines @@
       PictureLayerTilingSet::TilingRange tiling_range = CurrentTilingRange();
       size_t current_tiling_range_offset = current_tiling_ - tiling_range.start;
       return tiling_range.end - 1 - current_tiling_range_offset;
     }
   }
   NOTREACHED();
   return 0;
 }
 
 }  // namespace cc