Switch the android overscroll glow to use UIResources.

cc/layers/ui_resource_layer.cc

Index: cc/layers/ui_resource_layer.cc
diff --git a/cc/layers/ui_resource_layer.cc b/cc/layers/ui_resource_layer.cc
index 09b8d9af4cc997b173111cfc2bc44f2fe67f5b22..3f6bb5dd5badfc8db4d9cc5a34ab0a03af997815 100644
--- a/cc/layers/ui_resource_layer.cc
+++ b/cc/layers/ui_resource_layer.cc
@@ -56,7 +56,7 @@ scoped_refptr<UIResourceLayer> UIResourceLayer::Create() {
 }
 
 UIResourceLayer::UIResourceLayer()
-    : Layer(),
+    : ContentsScalingLayer(),
       uv_top_left_(0.f, 0.f),
       uv_bottom_right_(1.f, 1.f) {
   vertex_opacity_[0] = 1.0f;
@@ -162,4 +162,20 @@ void UIResourceLayer::PushPropertiesTo(LayerImpl* layer) {
   }
 }
 
+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