CC: Have GPU-raster tiles exactly match the viewport.

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>
 #include <set>
@@ skipping 61 matching lines @@
                                                 client));
 }
 
 PictureLayerTiling::PictureLayerTiling(float contents_scale,
                                        const gfx::Size& layer_bounds,
                                        PictureLayerTilingClient* client)
     : contents_scale_(contents_scale),
       layer_bounds_(layer_bounds),
       resolution_(NON_IDEAL_RESOLUTION),
       client_(client),
-      tiling_data_(gfx::Size(), gfx::Size(), true),
+      tiling_data_(gfx::Size(), gfx::Size(), kBorderTexels),
       last_impl_frame_time_in_seconds_(0.0),
       has_visible_rect_tiles_(false),
       has_skewport_rect_tiles_(false),
       has_soon_border_rect_tiles_(false),
       has_eventually_rect_tiles_(false),
       eviction_tiles_cache_valid_(false),
       eviction_cache_tree_priority_(SAME_PRIORITY_FOR_BOTH_TREES) {
   gfx::Size content_bounds =
       gfx::ToCeiledSize(gfx::ScaleSize(layer_bounds, contents_scale));
   gfx::Size tile_size = client_->CalculateTileSize(content_bounds);
@@ skipping 1098 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