Don't let PaintInvalidationLocationChange shadow other reasons

third_party/WebKit/LayoutTests/platform/linux/fast/repaint/line-flow-with-floats-6-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow P",
           "rect": [8, 340, 418, 99],
           "reason": "invalidate paint rectangle"
         },
         {
           "object": "LayoutBlockFlow (floating) SPAN id='blueFloat'",
           "rect": [14, 363, 48, 65],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutText #text",
           "rect": [28, 363, 20, 20],
-          "reason": "location change"
+          "reason": "layoutObject insertion"
         },
         {
           "object": "InlineTextBox 'The players all played at once without waiting\n'",
           "reason": "full"
         },
         {
           "object": "InlineTextBox 'a very short time '",
           "reason": "full"
         },
         {
           "object": "InlineTextBox 'difficult game indeed.\n'",
           "reason": "full"
         },
         {
           "object": "InlineTextBox 'foo'",
-          "reason": "location change"
+          "reason": "layoutObject insertion"
         },
         {
           "object": "InlineTextBox 'for'",
           "reason": "full"
         },
         {
           "object": "InlineTextBox 'hedgehogs; and in\n'",
           "reason": "full"
         },
         {
@@ skipping 42 matching lines @@
         },
         {
           "object": "RootInlineBox",
           "reason": "full"
         }
       ]
     }
   ]
 }