Fix the bug that negative outline-offset is covered up by composited

third_party/WebKit/LayoutTests/compositing/overflow/universal-accelerated-overflow-scroll-expected.txt

Index: third_party/WebKit/LayoutTests/compositing/overflow/universal-accelerated-overflow-scroll-expected.txt
diff --git a/third_party/WebKit/LayoutTests/compositing/overflow/universal-accelerated-overflow-scroll-expected.txt b/third_party/WebKit/LayoutTests/compositing/overflow/universal-accelerated-overflow-scroll-expected.txt
index 150127f9467c1e2b44de069821ccd834282e8c74..2688e886b0633f90931bbb98e9eabc93b21aa23e 100644
--- a/third_party/WebKit/LayoutTests/compositing/overflow/universal-accelerated-overflow-scroll-expected.txt
+++ b/third_party/WebKit/LayoutTests/compositing/overflow/universal-accelerated-overflow-scroll-expected.txt
@@ -49,6 +49,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Layer (first squashed layer: LayoutBlockFlow (positioned) DIV id='positioned-absolute-grandchildren-not-contained' class='positionAbsolute positioned')",
       "position": [35, 75],
       "bounds": [80, 40],
@@ -111,6 +116,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Containment Layer",
       "shouldFlattenTransform": false
     },
@@ -170,6 +180,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Layer (first squashed layer: LayoutBlockFlow (positioned) DIV id='positioned-absolute-not-contained' class='positionAbsolute positioned')",
       "position": [275, 75],
       "bounds": [80, 40],
@@ -236,6 +251,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Layer (first squashed layer: LayoutBlockFlow (positioned) DIV id='positioned-absolute-sibling-grandchildren-not-contained' class='positionAbsolute positioned')",
       "position": [395, 75],
       "bounds": [80, 40],
@@ -298,6 +318,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Containment Layer",
       "shouldFlattenTransform": false
     },
@@ -357,6 +382,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Layer (first squashed layer: LayoutBlockFlow (positioned) DIV id='positioned-absolute-sibling-not-contained' class='positionAbsolute positioned')",
       "position": [155, 195],
       "bounds": [80, 40],
@@ -418,6 +448,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Containment Layer",
       "shouldFlattenTransform": false
     },
@@ -473,6 +508,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "Squashing Containment Layer",
       "shouldFlattenTransform": false
     },
@@ -529,6 +569,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "LayoutBlockFlow (positioned) DIV id='positioned-fixed-sibling-grandchildren' class='positionFixed positioned'",
       "position": [35, 315],
       "bounds": [80, 40],
@@ -592,6 +637,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "LayoutBlockFlow (positioned) DIV id='positioned-fixed-sibling' class='positionFixed positioned'",
       "position": [155, 315],
       "bounds": [80, 40],
@@ -656,6 +706,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "LayoutBlockFlow (positioned) DIV id='positioned-fixed-grandchildren' class='positionFixed positioned'",
       "position": [275, 315],
       "bounds": [80, 40],
@@ -719,6 +774,11 @@
       "drawsContent": true
     },
     {
+      "name": "Decoration Layer",
+      "bounds": [104, 104],
+      "drawsContent": true
+    },
+    {
       "name": "LayoutBlockFlow (positioned) DIV id='positioned-fixed' class='positionFixed positioned'",
       "position": [395, 315],
       "bounds": [80, 40],