Fix the bug that sticky element may not be correctly invalidated due to non-promotion

third_party/WebKit/LayoutTests/paint/invalidation/compositing/non-composited-sticky-element-repaint-expected.txt

+{
+  "layers": [
+    {
+      "name": "LayoutView #document",
+      "bounds": [785, 616],
+      "contentsOpaque": true,
+      "drawsContent": true,
+      "paintInvalidations": [
+        {
+          "object": "LayoutBlockFlow DIV id='scroller' class='scroller'",
+          "rect": [8, 8, 200, 600],
+          "reason": "subtree"
+        },
+        {
+          "object": "LayoutBlockFlow DIV id='scroller' class='scroller'",
+          "rect": [193, 8, 15, 585],
+          "reason": "scroll"
+        }
+      ]
+    },
+    {
+      "name": "Ancestor Clipping Layer",
+      "position": [8, 8],
+      "bounds": [185, 585],
+      "shouldFlattenTransform": false
+    },
+    {
+      "name": "LayoutBlockFlow DIV class='composited container'",

[flackr, 2017/04/27 14:22:56]

Shouldn't we see a paint invalidation in this container when the sticky position
element moves?

[yigu, 2017/04/27 15:20:10]

This box hasn't yet passed the starting constraint so no need to invalidate it.
Have added another box which moves and needs to be invalidated.

+      "position": [0, 100],
+      "bounds": [185, 1000],
+      "contentsOpaque": true,
+      "drawsContent": true,
+      "backgroundColor": "#008000"
+    }
+  ],
+  "objectPaintInvalidations": [
+    {
+      "object": "LayoutBlockFlow DIV id='scroller' class='scroller'",
+      "reason": "subtree"
+    },
+    {
+      "object": "VerticalScrollbar",
+      "reason": "scroll"
+    },
+    {
+      "object": "LayoutBlockFlow DIV class='spacer'",
+      "reason": "subtree"
+    }
+  ]
+}
+