cc: Update picture pile on tiles to prevent memory leak

cc/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/picture_layer_impl.h"
 
 #include "base/time.h"
 #include "cc/append_quads_data.h"
 #include "cc/checkerboard_draw_quad.h"
 #include "cc/debug_border_draw_quad.h"
@@ skipping 162 matching lines @@
       time_delta);
 
   last_screen_space_transform_ = current_screen_space_transform;
   last_update_time_ = current_time;
   last_bounds_ = bounds();
   last_content_bounds_ = contentBounds();
   last_content_scale_ = contentsScaleX();
 }
 
 void PictureLayerImpl::didBecomeActive() {
-  tilings_.MoveTilePriorities(PENDING_TREE, ACTIVE_TREE);
+  tilings_.DidBecomeActive();
 }
 
 void PictureLayerImpl::didLoseOutputSurface() {
   tilings_.RemoveAllTilings();
 }
 
 void PictureLayerImpl::calculateContentsScale(
     float ideal_contents_scale,
     float* contents_scale_x,
     float* contents_scale_y,
@@ skipping 36 matching lines @@
 
   return make_scoped_refptr(new Tile(
       tile_manager,
       pile_.get(),
       rect.size(),
       GL_RGBA,
       rect,
       tiling->contents_scale()));
 }
 
+void PictureLayerImpl::UpdatePile(Tile* tile) {
+  tile->set_picture_pile(pile_);
+}
+
 void PictureLayerImpl::SyncFromActiveLayer() {
   DCHECK(layerTreeImpl()->IsPendingTree());
   if (!drawsContent())
     return;
 
   // If there is an active tree version of this layer, get a copy of its
   // tiles.  This needs to be done last, after setting invalidation and the
   // pile.
   PictureLayerImpl* active_twin = static_cast<PictureLayerImpl*>(
       layerTreeImpl()->FindActiveTreeLayerById(id()));
@@ skipping 196 matching lines @@
     if (std::find(used_tilings.begin(), used_tilings.end(), tiling) ==
         used_tilings.end())
       to_remove.push_back(tiling);
   }
 
   for (size_t i = 0; i < to_remove.size(); ++i)
     tilings_.Remove(to_remove[i]);
 }
 
 }  // namespace cc