Reduce the requirement for saving previousLocation

third_party/WebKit/LayoutTests/paint/invalidation/window-resize-percent-html-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [600, 250],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutView #document",
           "rect": [0, 250, 600, 250],
           "reason": "incremental"
         },
         {
           "object": "LayoutBlockFlow DIV",
-          "rect": [0, 0, 300, 125],
-          "reason": "border box change"
+          "rect": [0, 62, 300, 63],
+          "reason": "incremental"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
       "object": "LayoutBlockFlow DIV",
-      "reason": "border box change"
+      "reason": "incremental"
     }
   ]
 }
 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [400, 250],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
-          "object": "LayoutBlockFlow DIV",
-          "rect": [0, 0, 300, 63],
-          "reason": "border box change"
-        },
-        {
           "object": "LayoutView #document",
           "rect": [400, 0, 200, 250],
           "reason": "incremental"
+        },
+        {
+          "object": "LayoutBlockFlow DIV",
+          "rect": [200, 0, 100, 63],
+          "reason": "incremental"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
       "object": "LayoutBlockFlow DIV",
-      "reason": "border box change"
+      "reason": "incremental"
     }
   ]
 }
 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [400, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutView #document",
           "rect": [0, 250, 400, 350],
           "reason": "incremental"
         },
         {
           "object": "LayoutBlockFlow DIV",
-          "rect": [0, 0, 200, 150],
-          "reason": "border box change"
+          "rect": [0, 62, 200, 88],
+          "reason": "incremental"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
       "object": "LayoutBlockFlow DIV",
-      "reason": "border box change"
+      "reason": "incremental"
     }
   ]
 }
 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
@@ skipping 16 matching lines @@
       "object": "LayoutView #document",
       "reason": "incremental"
     },
     {
       "object": "LayoutBlockFlow DIV",
       "reason": "incremental"
     }
   ]
 }