Don't let PaintInvalidationLocationChange shadow other reasons

third_party/WebKit/LayoutTests/platform/linux/fast/repaint/bugzilla-6278-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [10, 138, 292, 160],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [10, 303, 292, 50],
-          "reason": "location change"
+          "reason": "bounds change"
         },
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [10, 138, 242, 180],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow DIV",
           "rect": [10, 323, 242, 50],
-          "reason": "location change"
+          "reason": "bounds change"
         },
         {
           "object": "LayoutTableCell TD id='col1'",
           "rect": [10, 353, 242, 20],
           "reason": "incremental"
         },
         {
           "object": "LayoutText #text",
           "rect": [10, 297, 240, 20],
           "reason": "incremental"
         },
         {
           "object": "LayoutTableCell TD id='target'",
           "rect": [254, 138, 52, 235],
-          "reason": "location change"
+          "reason": "bounds change"
         },
         {
           "object": "LayoutTableCell TD id='col1'",
           "rect": [252, 138, 50, 215],
           "reason": "incremental"
         },
         {
           "object": "LayoutText #text",
           "rect": [250, 138, 49, 159],
           "reason": "incremental"
@@ skipping 100 matching lines @@
         },
         {
           "object": "RootInlineBox",
           "reason": "full"
         }
       ]
     }
   ]
 }