Paint solid color background into both scrolling contents layer and graphics layer.

third_party/WebKit/Source/core/layout/compositing/CompositedLayerMappingTest.cpp

 // Copyright 2014 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 "core/layout/compositing/CompositedLayerMapping.h"
 
 #include "core/frame/FrameView.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/api/LayoutViewItem.h"
@@ skipping 906 matching lines @@
   document().frame()->settings()->setPreferCompositingToLCDTextEnabled(true);
   setBodyInnerHTML(
       "<div id='container' style='overflow: scroll; width: 300px; height: "
       "300px; border-radius: 5px; background: white; will-change: transform;'>"
       "    <div style='background-color: blue; width: 2000px; height: "
       "2000px;'></div>"
       "</div>");
 
   PaintLayer* layer =
       toLayoutBlock(getLayoutObjectByElementId("container"))->layer();
-  EXPECT_TRUE(layer->canPaintBackgroundOntoScrollingContentsLayer());
+  EXPECT_EQ(BackgroundPaintInScrollingContents,
+            layer->backgroundPaintLocation());
 
   // We currently don't use composited scrolling when the container has a
   // border-radius so even though we can paint the background onto the scrolling
   // contents layer we don't have a scrolling contents layer to paint into in
   // this case.
   CompositedLayerMapping* mapping = layer->compositedLayerMapping();
   EXPECT_FALSE(mapping->hasScrollingLayer());
   EXPECT_FALSE(mapping->backgroundPaintsOntoScrollingContentsLayer());
 }
 
@@ skipping 139 matching lines @@
     document().view()->updateAllLifecyclePhases();
     ASSERT_EQ(document().documentElement(),
               rootScrollerController.globalRootScroller());
 
     EXPECT_TRUE(mapping3->clippingLayer());
     EXPECT_TRUE(mapping3->clippingLayer()->platformLayer()->masksToBounds());
   }
 }
 
 }  // namespace blink