Account for total glyph overflow in CachingWordShaper::width

third_party/WebKit/LayoutTests/platform/linux/fast/repaint/line-flow-with-floats-4-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [372, 447, 48, 17],
-        [369, 440, 51, 59],
+        [369, 440, 52, 59],
         [8, 380, 418, 219]
       ],
       "paintInvalidationClients": [
         "InlineTextBox 'The players all played at once without waiting\n'",
         "InlineTextBox 'for'",
         "RootInlineBox",
         "InlineTextBox 'turns,\n'",
         "InlineTextBox 'quarrelling all the while, and fighting for the'",
         "RootInlineBox",
         "InlineTextBox 'hedgehogs; and in\n'",
@@ skipping 27 matching lines @@
         "InlineTextBox 'was in a furious passion, and went\n'",
         "InlineTextBox 'stamping about, and'",
         "InlineTextBox 'shouting \u2018Off with his head!\u2019 or \u2018Off with\n'",
         "InlineTextBox 'her head!\u2019 about once in'",
         "InlineTextBox 'a minute.\n'"
       ]
     }
   ]
 }