cc: Remove and Create the correct tiles when resizing live tiles rect

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 487 matching lines @@
 
   last_impl_frame_time_in_seconds_ = current_frame_time_in_seconds;
   last_visible_rect_in_content_space_ = visible_rect_in_content_space;
 
   eviction_tiles_cache_valid_ = false;
 
   TilePriority now_priority(resolution_, TilePriority::NOW, 0);
   float content_to_screen_scale = ideal_contents_scale / contents_scale_;
 
   // Assign now priority to all visible tiles.
-  bool include_borders = true;
+  bool include_borders = false;
   has_visible_rect_tiles_ = false;
   for (TilingData::Iterator iter(
            &tiling_data_, visible_rect_in_content_space, include_borders);
        iter;
        ++iter) {
     TileMap::iterator find = tiles_.find(iter.index());
     if (find == tiles_.end())
       continue;
     has_visible_rect_tiles_ = true;
     Tile* tile = find->second.get();
@@ skipping 413 matching lines @@
     PictureLayerTiling* tiling,
     WhichTree tree)
     : tiling_(tiling), phase_(VISIBLE_RECT), tree_(tree), current_tile_(NULL) {
   if (!tiling_->has_visible_rect_tiles_) {
     AdvancePhase();
     return;
   }
 
   visible_iterator_ = TilingData::Iterator(&tiling_->tiling_data_,
                                            tiling_->current_visible_rect_,
                                            true /* include_borders */);

[vmpstr, 2014/08/26 20:52:33]

Can you fix this up as well, while here? The iterators should mimic whatever
UpdateTilePriorities is currently doing. This might also mean changing
SpiralDifferenceIterator to do what the DifferenceIterator is now doing.

[danakj, 2014/08/26 20:57:05]

Done! PTAL

   if (!visible_iterator_) {
     AdvancePhase();
     return;
   }
 
   current_tile_ =
       tiling_->TileAt(visible_iterator_.index_x(), visible_iterator_.index_y());
   if (!current_tile_ || !TileNeedsRaster(current_tile_))
     ++(*this);
 }
@@ skipping 136 matching lines @@
   DCHECK(*this);
   do {
     ++current_eviction_tiles_index_;
   } while (current_eviction_tiles_index_ != eviction_tiles_->size() &&
            !(*eviction_tiles_)[current_eviction_tiles_index_]->HasResources());
 
   return *this;
 }
 
 }  // namespace cc