Don't let PaintInvalidationLocationChange shadow other reasons

third_party/WebKit/LayoutTests/svg/custom/mask-invalidation-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutSVGRect rect id='maskRect'",
           "rect": [100, 100, 460, 316],
-          "reason": "location change"
+          "reason": "full"
         },
         {
           "object": "LayoutSVGRect rect id='maskRect'",
           "rect": [50, 50, 460, 316],
-          "reason": "location change"
+          "reason": "full"
         },
         {
           "object": "LayoutSVGContainer g id='root'",
           "rect": [50, 50, 453, 299],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGRect rect",
           "rect": [50, 50, 453, 299],
           "reason": "layoutObject removal"
         },
         {
           "object": "LayoutSVGRoot svg",
           "rect": [50, 50, 453, 299],
           "reason": "bounds change"
         },
         {
           "object": "LayoutSVGRect rect",
           "rect": [100, 100, 403, 249],
           "reason": "layoutObject insertion"
         }
       ]
     }
   ]
 }