Account for total glyph overflow in CachingWordShaper::width

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],
-        [143, 420, 64, 19],
+        [303, 420, 67, 19],
+        [143, 420, 65, 19],
         [134, 360, 131, 19],
         [83, 360, 131, 19],
         [65, 380, 304, 59],
         [65, 380, 287, 19],
-        [14, 500, 406, 99],
-        [14, 480, 406, 99],
+        [14, 500, 407, 99],
+        [14, 480, 407, 99],
         [14, 440, 355, 59],
         [14, 420, 355, 59],
         [14, 380, 354, 59],
         [14, 380, 298, 19],
         [14, 363, 48, 65],
         [8, 586, 418, 14],
         [8, 583, 418, 17],
         [8, 80, 418, 519],
         [0, 0, 485, 600]
       ],
@@ skipping 88 matching lines @@
         "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'",
         "VerticalScrollbar"
       ]
     }
   ]
 }