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

cc/picture_layer_tiling_set.cc

Index: cc/picture_layer_tiling_set.cc
diff --git a/cc/picture_layer_tiling_set.cc b/cc/picture_layer_tiling_set.cc
index d18145162e308df6eac6a34859e3180b8443d5f7..c95d4865699c3e253ea7b743b6ad5c9120c26120 100644
--- a/cc/picture_layer_tiling_set.cc
+++ b/cc/picture_layer_tiling_set.cc
@@ -106,10 +106,12 @@ 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);
 
@@ -242,7 +244,8 @@ PictureLayerTilingSet::Iterator& PictureLayerTilingSet::Iterator::operator++() {
     tiling_iter_ = PictureLayerTiling::Iterator(
         set_->tilings_[current_tiling_],
         contents_scale_,
-        last_rect);
+        last_rect,
+        layer_device_alignment_);
   }
 
   return *this;