cc : Snap texture layers to pixel boundary

cc/layers/texture_layer_impl.cc

 // Copyright 2011 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/layers/texture_layer_impl.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <vector>
@@ skipping 39 matching lines @@
   own_mailbox_ = true;
   valid_texture_copy_ = false;
   SetNeedsPushProperties();
 }
 
 std::unique_ptr<LayerImpl> TextureLayerImpl::CreateLayerImpl(
     LayerTreeImpl* tree_impl) {
   return TextureLayerImpl::Create(tree_impl, id());
 }
 
+bool TextureLayerImpl::IsSnapped() {
+  return true;
+}
+
 void TextureLayerImpl::PushPropertiesTo(LayerImpl* layer) {
   LayerImpl::PushPropertiesTo(layer);
 
   TextureLayerImpl* texture_layer = static_cast<TextureLayerImpl*>(layer);
   texture_layer->SetFlipped(flipped_);
   texture_layer->SetUVTopLeft(uv_top_left_);
   texture_layer->SetUVBottomRight(uv_bottom_right_);
   texture_layer->SetVertexOpacity(vertex_opacity_);
   texture_layer->SetPremultipliedAlpha(premultiplied_alpha_);
   texture_layer->SetBlendBackgroundColor(blend_background_color_);
@@ skipping 189 matching lines @@
   } else if (external_texture_resource_) {
     DCHECK(!own_mailbox_);
     ResourceProvider* resource_provider =
         layer_tree_impl()->resource_provider();
     resource_provider->DeleteResource(external_texture_resource_);
     external_texture_resource_ = 0;
   }
 }
 
 }  // namespace cc