cc: Stretch textures by .5 texels to prevent out of bounds sampling

cc/picture_layer_tiling_set.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_tiling_set.h"
 
 namespace cc {
 
 namespace {
 
@@ skipping 88 matching lines @@
 
 void PictureLayerTilingSet::CreateTilesFromLayerRect(gfx::Rect layer_rect) {
   for (size_t i = 0; i < tilings_.size(); ++i)
     tilings_[i]->CreateTilesFromLayerRect(layer_rect);
 }
 
 PictureLayerTilingSet::Iterator::Iterator(
     const PictureLayerTilingSet* set,
     float contents_scale,
     gfx::Rect content_rect,
-    float ideal_contents_scale)
+    float ideal_contents_scale,
+    PictureLayerTiling::LayerDeviceAlignment layerDeviceAlignment)
     : set_(set),
       contents_scale_(contents_scale),
       ideal_contents_scale_(ideal_contents_scale),
+      layer_device_alignment_(layerDeviceAlignment),
       current_tiling_(-1) {
   missing_region_.Union(content_rect);
 
   for (ideal_tiling_ = 0;
        static_cast<size_t>(ideal_tiling_) < set_->tilings_.size();
        ++ideal_tiling_) {
     PictureLayerTiling* tiling = set_->tilings_[ideal_tiling_];
     if (tiling->contents_scale() < ideal_contents_scale_) {
       if (ideal_tiling_ > 0)
         ideal_tiling_--;
@@ skipping 112 matching lines @@
 
     // Done, found next checkerboard rect to return.
     if (current_tiling_ >= static_cast<int>(set_->tilings_.size()))
       return *this;
 
     // Construct a new iterator for the next tiling, but we need to loop
     // again until we get to a valid one.
     tiling_iter_ = PictureLayerTiling::Iterator(
         set_->tilings_[current_tiling_],
         contents_scale_,
-        last_rect);
+        last_rect,
+        layer_device_alignment_);
   }
 
   return *this;
 }
 
 PictureLayerTilingSet::Iterator::operator bool() const {
   return current_tiling_ < static_cast<int>(set_->tilings_.size()) ||
       region_iter_.has_rect();
 }
 
@@ skipping 33 matching lines @@
         current_frame_time);
   }
 }
 
 void PictureLayerTilingSet::DidBecomeActive() {
   for (size_t i = 0; i < tilings_.size(); ++i)
     tilings_[i]->DidBecomeActive();
 }
 
 }  // namespace cc