Don't include scroll offset in offsetFromLayoutObject for scrolling contents layers.

third_party/WebKit/LayoutTests/paint/invalidation/invalidation-on-foreground-graphics-layer-expected.txt

Index: third_party/WebKit/LayoutTests/paint/invalidation/invalidation-on-foreground-graphics-layer-expected.txt
diff --git a/third_party/WebKit/LayoutTests/compositing/overflow/updating-scrolling-content-expected.txt b/third_party/WebKit/LayoutTests/paint/invalidation/invalidation-on-foreground-graphics-layer-expected.txt
similarity index 57%
copy from third_party/WebKit/LayoutTests/compositing/overflow/updating-scrolling-content-expected.txt
copy to third_party/WebKit/LayoutTests/paint/invalidation/invalidation-on-foreground-graphics-layer-expected.txt
index bbe10465523e7b6e3bdc6662e451b44381446241..b048d5212dd133af758249988d18c8e442071220 100644
--- a/third_party/WebKit/LayoutTests/compositing/overflow/updating-scrolling-content-expected.txt
+++ b/third_party/WebKit/LayoutTests/paint/invalidation/invalidation-on-foreground-graphics-layer-expected.txt
@@ -9,29 +9,43 @@
         {
           "position": [8, 8],
           "bounds": [200, 200],
+          "contentsOpaque": true,
           "shouldFlattenTransform": false,
           "drawsContent": true,
-          "paintInvalidations": [
-            {
-              "object": "LayoutBlockFlow DIV id='indicator'",
-              "rect": [0, 0, 185, 200],
-              "reason": "style change"
-            }
-          ],
+          "backgroundColor": "#D3D3D3",
           "children": [
             {
               "bounds": [185, 185],
               "shouldFlattenTransform": false,
               "children": [
                 {
-                  "bounds": [185, 1200],
+                  "bounds": [300, 300],
                   "drawsContent": true,
                   "paintInvalidations": [
                     {
-                      "object": "LayoutBlockFlow DIV id='indicator'",
-                      "rect": [0, 0, 185, 200],
+                      "object": "LayoutBlockFlow DIV id='target'",
+                      "rect": [100, 100, 200, 200],

[chrishtr, 2016/05/31 18:14:47]

This is the scrolling contents layer.

                       "reason": "style change"
                     }
+                  ],
+                  "children": [
+                    {
+                      "bounds": [200, 200],
+                      "contentsOpaque": true,
+                      "drawsContent": true,
+                      "backgroundColor": "#ADD8E6"
+                    },
+                    {
+                      "bounds": [300, 300],
+                      "drawsContent": true,
+                      "paintInvalidations": [
+                        {
+                          "object": "LayoutBlockFlow DIV id='target'",

[chrishtr, 2016/05/31 18:14:47]

This is the foreground layer.

+                          "rect": [100, 100, 200, 200],
+                          "reason": "style change"
+                        }
+                      ]
+                    }
                   ]
                 }
               ]
@@ -45,14 +59,7 @@
                 },
                 {
                   "position": [185, 0],
-                  "bounds": [15, 185],
-                  "paintInvalidations": [
-                    {
-                      "object": "Vertical Scrollbar Layer",
-                      "rect": [0, 0, 15, 185],
-                      "reason": "full"
-                    }
-                  ]
+                  "bounds": [15, 185]
                 },
                 {
                   "position": [185, 185],