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

third_party/WebKit/LayoutTests/paint/invalidation/composited-overflow-with-negative-offset-outline-expected.txt

+{
+  "layers": [
+    {
+      "name": "LayoutView #document",
+      "bounds": [800, 600],
+      "contentsOpaque": true,
+      "drawsContent": true
+    },
+    {
+      "name": "LayoutBlockFlow DIV id='scroller'",
+      "position": [8, 8],
+      "bounds": [200, 200],
+      "shouldFlattenTransform": false,
+      "drawsContent": true,
+      "paintInvalidations": [
+        {
+          "object": "LayoutBlockFlow DIV id='scroller'",
+          "rect": [0, 0, 200, 200],
+          "reason": "style change"
+        }
+      ]
+    },
+    {
+      "name": "Scrolling Layer",
+      "bounds": [185, 185],
+      "shouldFlattenTransform": false
+    },
+    {
+      "name": "Scrolling Contents Layer",
+      "bounds": [185, 300],
+      "drawsContent": true
+    },
+    {
+      "name": "Overflow Controls Host Layer",
+      "bounds": [200, 200]
+    },
+    {
+      "name": "Horizontal Scrollbar Layer",
+      "position": [0, 185],
+      "bounds": [185, 15]
+    },
+    {
+      "name": "Vertical Scrollbar Layer",
+      "position": [185, 0],
+      "bounds": [15, 185]
+    },
+    {
+      "name": "Scroll Corner Layer",
+      "position": [185, 185],
+      "bounds": [15, 15],
+      "drawsContent": true
+    },
+    {
+      "name": "Decoration Layer",
+      "bounds": [200, 200],
+      "drawsContent": true,
+      "paintInvalidations": [
+        {
+          "object": "LayoutBlockFlow DIV id='scroller'",
+          "rect": [0, 0, 200, 200],
+          "reason": "style change"
+        }
+      ]
+    }
+  ],
+  "objectPaintInvalidations": [
+    {
+      "object": "LayoutBlockFlow DIV id='scroller'",
+      "reason": "style change"
+    }
+  ]
+}
+