Repaint when background switches painting from/to scrolling contents layer.

third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-local-background-removed.html

Index: third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-local-background-removed.html
diff --git a/third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background.html b/third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-local-background-removed.html
similarity index 69%
copy from third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background.html
copy to third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-local-background-removed.html
index 1f3dd06c2d6ad1ec10dff7363459d535f0858608..88a390095c81fdbe719e9745eecedd773635a65b 100644
--- a/third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background.html
+++ b/third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-local-background-removed.html
@@ -2,13 +2,12 @@
 <script src="../../fast/repaint/resources/text-based-repaint.js"></script>
 <script>
 function repaintTest() {
-    scroller.style.background = 'green local';
+    scroller.style.background = '';
 }
 onload = runRepaintAndPixelTest;
 </script>
 <style>
 #scroller {
-    background: red local;
     overflow: scroll;
     width: 200px;
     height: 200px;
@@ -20,7 +19,8 @@ onload = runRepaintAndPixelTest;
 }
 </style>
 <!-- #scroller has a locally attached background which will be painted into the
-    scrolling contents layer. When the color changes it should repaint. -->
-<div id="scroller">
+    scrolling contents layer. When the color is removed it should be cleared. -->
+<div id="scroller" style="background: red local;">
+    <p>Content</p>
     <div class="spacer"></div>
 </div>