Reduce the requirement for saving previousLocation

third_party/WebKit/LayoutTests/platform/mac/paint/invalidation/flexbox/repaint-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutBlockFlow DIV id='content'",
@@ skipping 60 matching lines @@
           "rect": [400, 116, 391, 162],
           "reason": "forced by layout"
         },
         {
           "object": "LayoutBlockFlow DIV id='left'",
           "rect": [148, 116, 252, 162],
           "reason": "incremental"
         },
         {
           "object": "LayoutBlockFlow DIV id='left'",
-          "rect": [8, 116, 140, 108],
-          "reason": "border box change"
+          "rect": [8, 206, 140, 18],
+          "reason": "incremental"
+        },
+        {
+          "object": "LayoutBlockFlow DIV id='left'",
+          "rect": [138, 116, 10, 108],
+          "reason": "incremental"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow DIV id='left'",
       "reason": "incremental"
     },
     {
@@ skipping 31 matching lines @@
     {
       "object": "InlineTextBox 'condimentum leo neque sed nulla. Nunc quis porta elit. Pellentesque erat lectus, ultricies a lobortis'",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox 'id, faucibus id quam.'",
       "reason": "forced by layout"
     },
     {
       "object": "LayoutBlockFlow DIV id='left'",
-      "reason": "border box change"
+      "reason": "incremental"
     },
     {
       "object": "LayoutBlockFlow DIV id='content'",
       "reason": "style change"
     },
     {
       "object": "LayoutBlockFlow P",
       "reason": "forced by layout"
     },
     {
@@ skipping 20 matching lines @@
       "object": "InlineTextBox 'Sed volutpat, tellus vel varius vestibulum, purus quam mollis sapien, in condimentum leo neque sed'",
       "reason": "forced by layout"
     },
     {
       "object": "InlineTextBox 'nulla. Nunc quis porta elit. Pellentesque erat lectus, ultricies a lobortis id, faucibus id quam.'",
       "reason": "forced by layout"
     }
   ]
 }