Calculate paint invalidation rect for scrollbars

third_party/WebKit/LayoutTests/platform/linux/fast/repaint/line-flow-with-floats-8-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [485, 0, 15, 600],
         [303, 420, 66, 19],
@@ skipping 70 matching lines @@
         "InlineTextBox 'the Queen'",
         "RootInlineBox",
         "InlineTextBox 'was in a furious passion, and went\n'",
         "InlineTextBox 'stamping about, and'",
         "RootInlineBox",
         "InlineTextBox 'shouting \u2018Off with his head!\u2019 or \u2018Off with\n'",
         "InlineTextBox 'her head!\u2019 about'",
         "RootInlineBox",
         "InlineTextBox 'once in a minute.\n'",
         "RootInlineBox",
-        "VerticalScrollbar",
-        "LayoutIFrame IFRAME id='iframe'",
         "LayoutBlockFlow HTML",
         "LayoutBlockFlow P",
         "LayoutBlockFlow P",
         "LayoutText #text",
         "InlineTextBox 'difficult game indeed.\n'",
         "LayoutText #text",
         "InlineTextBox 'The players all played at once without waiting\n'",
         "LayoutText #text",
         "InlineTextBox 'for turns,'",
         "InlineTextBox 'quarrelling all the while, and fighting for the hedgehogs; and'",
         "InlineTextBox 'in\n'",
         "InlineTextBox 'a very short time '",
         "LayoutText #text",
         "InlineTextBox 'the Queen'",
         "LayoutText #text",
         "InlineTextBox ' was in a furious passion,'",
         "InlineTextBox 'and went\n'",
         "InlineTextBox 'stamping about, and shouting \u2018Off with his head!\u2019'",
         "InlineTextBox 'or \u2018Off with\n'",
         "InlineTextBox 'her head!\u2019 about once in a minute.\n'",
         "LayoutText #text",
         "InlineTextBox 'Alice began to feel very uneasy: to be sure, she had not as\n'",
         "InlineTextBox 'yet had'",
         "InlineTextBox 'any dispute with the Queen, but she knew that it might\n'",
         "InlineTextBox 'happen any'",
         "InlineTextBox 'minute, \u2018and then,\u2019 thought she, \u2018what would become of\n'",
         "InlineTextBox 'me?'",
         "InlineTextBox 'They\u2019re dreadfully fond of beheading people here; the great'",
-        "InlineTextBox 'wonder is, that there\u2018s any one left alive!\u2019'"
+        "InlineTextBox 'wonder is, that there\u2018s any one left alive!\u2019'",
+        "VerticalScrollbar"
       ]
     }
   ]
 }