cc: Clear tile priorities when tiling is reset.

cc/resources/picture_layer_tiling.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/picture_layer_tiling.h"
 
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
@@ skipping 380 matching lines @@
 
   return texture_rect;
 }
 
 gfx::Size PictureLayerTiling::CoverageIterator::texture_size() const {
   return tiling_->tiling_data_.max_texture_size();
 }
 
 void PictureLayerTiling::Reset() {
   live_tiles_rect_ = gfx::Rect();
+  for (TileMap::const_iterator it = tiles_.begin(); it != tiles_.end(); ++it)
+    ReleaseTile(it->second.get(), client_->GetTree());
   tiles_.clear();
 }
 
 gfx::Rect PictureLayerTiling::ComputeSkewport(
     double current_frame_time_in_seconds,
     const gfx::Rect& visible_rect_in_content_space) const {
   gfx::Rect skewport = visible_rect_in_content_space;
   if (last_impl_frame_time_in_seconds_ == 0.0)
     return skewport;
 
@@ skipping 611 matching lines @@
   DCHECK(*this);
   do {
     ++tile_iterator_;
   } while (tile_iterator_ != tiling_->eviction_tiles_cache_.end() &&
            (!(*tile_iterator_)->HasResources()));
 
   return *this;
 }
 
 }  // namespace cc