Optimize baselines for paint/invalidation

Change-Id: I75b1f41dd03cb9b76d00cd99dc359d825053e351
Reviewed-on: https://chromium-review.googlesource.com/948263
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#540845}

third_party/WebKit/LayoutTests/paint/invalidation/background/background-image-paint-invalidation-large-abspos-div-expected.txt

-layer at (0,0) size 800x600 clip at (0,0) size 785x600 scrollY 3000.00 scrollHeight 4008
-  LayoutView at (0,0) size 800x600
-layer at (0,0) size 785x557
-  LayoutBlockFlow {HTML} at (0,0) size 785x557
-    LayoutBlockFlow {BODY} at (8,8) size 769x541
-      LayoutImage {IMG} at (0,0) size 489x537
-      LayoutText {#text} at (0,0) size 0x0
-layer at (8,8) size 100x4000 backgroundClip at (0,0) size 785x600 clip at (0,0) size 785x600
-  LayoutBlockFlow (positioned) {DIV} at (8,8) size 100x4000
-scrolled to 0,3000

third_party/WebKit/LayoutTests/paint/invalidation/scroll/outline-change-in-scrollers-expected.txt

-{
-  "layers": [
-    {
-      "name": "LayoutView #document",
-      "bounds": [800, 600],
-      "drawsContent": false,
-      "contentsOpaque": true,
-      "backgroundColor": "#FFFFFF",
-      "paintInvalidations": [
-        {
-          "object": "LayoutBlockFlow DIV class='target'",
-          "rect": [286, 173, 75, 75],
-          "reason": "style change"
-        },
-        {
-          "object": "LayoutBlockFlow DIV class='target'",
-          "rect": [286, 18, 75, 75],
-          "reason": "style change"
-        },
-        {
-          "object": "LayoutBlockFlow DIV class='target'",
-          "rect": [172, 173, 75, 75],
-          "reason": "style change"
-        },
-        {
-          "object": "LayoutBlockFlow DIV class='target'",
-          "rect": [172, 18, 75, 75],
-          "reason": "style change"
-        },
-        {
-          "object": "LayoutBlockFlow DIV class='target'",
-          "rect": [53, 153, 75, 75],
-          "reason": "style change"
-        },
-        {
-          "object": "LayoutBlockFlow DIV class='target'",
-          "rect": [18, 18, 75, 75],
-          "reason": "style change"
-        }
-      ]
-    }
-  ],
-  "objectPaintInvalidations": [
-    {
-      "object": "LayoutBlockFlow DIV class='target'",
-      "reason": "style change"
-    },
-    {
-      "object": "LayoutBlockFlow DIV class='target'",
-      "reason": "style change"
-    },
-    {
-      "object": "LayoutBlockFlow DIV class='target'",
-      "reason": "style change"
-    },
-    {
-      "object": "LayoutBlockFlow DIV class='target'",
-      "reason": "style change"
-    },
-    {
-      "object": "LayoutBlockFlow DIV class='target'",
-      "reason": "style change"
-    },
-    {
-      "object": "LayoutBlockFlow DIV class='target'",
-      "reason": "style change"
-    }
-  ]
-}
-

third_party/WebKit/LayoutTests/platform/mac-mac10.11/paint/invalidation/forms/checkbox-focus-by-mouse-then-keydown-expected.txt

-{
-  "layers": [
-    {
-      "name": "LayoutView #document",
-      "bounds": [800, 600],
-      "drawsContent": false,
-      "backgroundColor": "#FFFFFF"
-    },
-    {
-      "name": "Scrolling Layer",
-      "bounds": [800, 600],
-      "drawsContent": false
-    },
-    {
-      "name": "Scrolling Contents Layer",
-      "bounds": [800, 600],
-      "contentsOpaque": true,
-      "backgroundColor": "#FFFFFF",
-      "paintInvalidations": [
-        {
-          "object": "LayoutBlockFlow INPUT",
-          "rect": [5, 7, 23, 22],
-          "reason": "subtree"
-        }
-      ]
-    }
-  ],
-  "objectPaintInvalidations": [
-    {
-      "object": "LayoutBlockFlow INPUT",
-      "reason": "subtree"
-    }
-  ]
-}
-

third_party/WebKit/LayoutTests/platform/mac-mac10.11/paint/invalidation/forms/radio-focus-by-mouse-then-keydown-expected.txt

-{
-  "layers": [
-    {
-      "name": "LayoutView #document",
-      "bounds": [800, 600],
-      "drawsContent": false,
-      "backgroundColor": "#FFFFFF"
-    },
-    {
-      "name": "Scrolling Layer",
-      "bounds": [800, 600],
-      "drawsContent": false
-    },
-    {
-      "name": "Scrolling Contents Layer",
-      "bounds": [800, 600],
-      "contentsOpaque": true,
-      "backgroundColor": "#FFFFFF",
-      "paintInvalidations": [
-        {
-          "object": "LayoutBlockFlow INPUT",
-          "rect": [5, 6, 23, 23],
-          "reason": "subtree"
-        }
-      ]
-    }
-  ],
-  "objectPaintInvalidations": [
-    {
-      "object": "LayoutBlockFlow INPUT",
-      "reason": "subtree"
-    }
-  ]
-}
-