Dirty line boxes correctly when a float gets layout

LayoutTests/platform/linux/fast/repaint/line-flow-with-floats-9-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "repaintRects": [
         [420, 240, 1, 139],
         [372, 243, 48, 48],
-        [8, 200, 418, 399]
+        [8, 80, 418, 519]
       ],
       "paintInvalidationClients": [
+        "InlineTextBox 'The chief difficulty Alice found at first was in managing her'",
+        "RootInlineBox",
+        "InlineTextBox 'flamingo: she succeeded in getting its body tucked away,'",
+        "RootInlineBox",
+        "InlineTextBox 'comfortably enough, under her arm, with its legs hanging'",
+        "RootInlineBox",
+        "InlineTextBox 'down,\n'",
+        "InlineTextBox 'but generally, just as she had got its neck nicely'",
+        "RootInlineBox",
+        "InlineTextBox 'straightened\n'",
+        "InlineTextBox 'out, and was going to give the hedgehog a'",
+        "RootInlineBox",
+        "InlineTextBox 'blow with its head, it\n'",
+        "InlineTextBox 'would'",
+        "InlineTextBox ' twist itself round and look up in her'",
+        "RootInlineBox",
         "InlineTextBox 'face, with\n'",
         "InlineTextBox 'such a puzzled expression that she could not help'",
         "RootInlineBox",
         "InlineTextBox 'bursting out\n'",
         "InlineTextBox 'laughing: and when she had got its head down, and was'",
         "RootInlineBox",
         "InlineTextBox 'going to\n'",
         "InlineTextBox 'begin again, it was very provoking to find that the'",
         "RootInlineBox",
         "InlineTextBox 'hedgehog had\n'",
@@ skipping 58 matching lines @@
         "InlineTextBox 'the doubled-up\n'",
         "InlineTextBox 'soldiers were always getting up and walking off to'",
         "InlineTextBox 'other parts of\n'",
         "InlineTextBox 'the ground, Alice soon came to the conclusion that it'",
         "InlineTextBox 'was a very\n'"
       ]
     }
   ]
 }