Invalidate scrolling contents layer on background invalidations painted into it.

third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background-expected.txt

Index: third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background-expected.txt
diff --git a/third_party/WebKit/LayoutTests/virtual/prefer_compositing_to_lcd_text/compositing/overflow/updating-scrolling-content-expected.txt b/third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background-expected.txt
similarity index 75%
copy from third_party/WebKit/LayoutTests/virtual/prefer_compositing_to_lcd_text/compositing/overflow/updating-scrolling-content-expected.txt
copy to third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background-expected.txt
index b06a918ca9bad93b25f0212a81ecb9cd8cb7bfc5..7ca439fcc184a32d7f64e2ec476ff0b66d8e093c 100644
--- a/third_party/WebKit/LayoutTests/virtual/prefer_compositing_to_lcd_text/compositing/overflow/updating-scrolling-content-expected.txt
+++ b/third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-local-background-expected.txt
@@ -14,6 +14,14 @@
           "bounds": [200, 200],
           "shouldFlattenTransform": false,
           "drawsContent": true,
+          "backgroundColor": "#008000",
+          "paintInvalidations": [
+            {
+              "object": "LayoutBlockFlow DIV id='scroller'",
+              "rect": [0, 0, 200, 200],
+              "reason": "style change"
+            }
+          ],
           "children": [
             {
               "name": "Scrolling Layer",
@@ -22,12 +30,13 @@
               "children": [
                 {
                   "name": "Scrolling Contents Layer",
-                  "bounds": [185, 1200],
+                  "bounds": [185, 300],
+                  "contentsOpaque": true,
                   "drawsContent": true,
                   "paintInvalidations": [
                     {
-                      "object": "LayoutBlockFlow DIV id='indicator'",
-                      "rect": [0, 0, 185, 200],
+                      "object": "LayoutBlockFlow DIV id='scroller'",
+                      "rect": [0, 0, 185, 300],
                       "reason": "style change"
                     }
                   ]
@@ -46,14 +55,7 @@
                 {
                   "name": "Vertical Scrollbar Layer",
                   "position": [185, 0],
-                  "bounds": [15, 185],
-                  "paintInvalidations": [
-                    {
-                      "object": "Vertical Scrollbar Layer",
-                      "rect": [0, 0, 15, 185],
-                      "reason": "full"
-                    }
-                  ]
+                  "bounds": [15, 185]
                 },
                 {
                   "name": "Scroll Corner Layer",
@@ -70,7 +72,7 @@
   ],
   "objectPaintInvalidations": [
     {
-      "object": "LayoutBlockFlow DIV id='indicator'",
+      "object": "LayoutBlockFlow DIV id='scroller'",
       "reason": "style change"
     }
   ]