Switch the android overscroll glow to use UIResources.

cc/layers/ui_resource_layer.cc

 // Copyright 2013 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/ui_resource_layer.h"
 
 #include "cc/layers/ui_resource_layer_impl.h"
 #include "cc/resources/prioritized_resource.h"
 #include "cc/resources/resource_update.h"
 #include "cc/resources/resource_update_queue.h"
@@ skipping 38 matching lines @@
 
 }  // anonymous namespace
 
 UIResourceLayer::UIResourceHolder::~UIResourceHolder() {}
 
 scoped_refptr<UIResourceLayer> UIResourceLayer::Create() {
   return make_scoped_refptr(new UIResourceLayer());
 }
 
 UIResourceLayer::UIResourceLayer()
-    : Layer(),
+    : ContentsScalingLayer(),
       uv_top_left_(0.f, 0.f),
       uv_bottom_right_(1.f, 1.f) {
   vertex_opacity_[0] = 1.0f;
   vertex_opacity_[1] = 1.0f;
   vertex_opacity_[2] = 1.0f;
   vertex_opacity_[3] = 1.0f;
 }
 
 UIResourceLayer::~UIResourceLayer() {}
 
@@ skipping 85 matching lines @@
 
     gfx::Size image_size =
         layer_tree_host()->GetUIResourceSize(ui_resource_holder_->id());
     layer_impl->SetUIResourceId(ui_resource_holder_->id());
     layer_impl->SetImageBounds(image_size);
     layer_impl->SetUV(uv_top_left_, uv_bottom_right_);
     layer_impl->SetVertexOpacity(vertex_opacity_);
   }
 }
 
+void UIResourceLayer::CalculateContentsScale(float ideal_contents_scale,
+                                             float device_scale_factor,
+                                             float page_scale_factor,
+                                             bool animating_transform_to_screen,
+                                             float* contents_scale_x,
+                                             float* contents_scale_y,
+                                             gfx::Size* content_bounds) {
+  if (!layer_tree_host() || !ui_resource_holder_ || !ui_resource_holder_->id())
+    return;
+  *contents_scale_x = 1.f;
+  *contents_scale_y = 1.f;
+  gfx::Size image_size =
+    layer_tree_host()->GetUIResourceSize(ui_resource_holder_->id());
+  *content_bounds = image_size;
+}
+
 }  // namespace cc