Simplify incremental paint invalidation

third_party/WebKit/LayoutTests/platform/linux/paint/invalidation/selection-partial-invalidation-between-blocks-expected.txt

 {
   "layers": [
     {
       "name": "LayoutView #document",
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "paintInvalidations": [
         {
           "object": "LayoutText #text",
           "rect": [11, 35, 74, 19],
+          "reason": "full"
+        },
+        {
+          "object": "LayoutText #text",
+          "rect": [11, 35, 74, 19],
           "reason": "selection"
         },
         {
           "object": "LayoutText #text",
           "rect": [11, 11, 55, 19],
-          "reason": "selection"
+          "reason": "full"
         },
         {
           "object": "LayoutText #text",
-          "rect": [81, 35, 4, 19],
-          "reason": "incremental"
-        },
-        {
-          "object": "LayoutText #text",
-          "rect": [62, 11, 4, 19],
-          "reason": "incremental"
+          "rect": [11, 11, 55, 19],
+          "reason": "selection"
         }
       ]
     }
   ],
   "objectPaintInvalidations": [
     {
       "object": "LayoutBlockFlow HTML",
       "reason": "selection"
     },
     {
@@ skipping 11 matching lines @@
     {
       "object": "LayoutText #text",
       "reason": "selection"
     },
     {
       "object": "InlineTextBox 'First cell'",
       "reason": "selection"
     },
     {
       "object": "LayoutText #text",
-      "reason": "incremental"
+      "reason": "full"
     },
     {
       "object": "InlineTextBox 'First cell'",
-      "reason": "incremental"
+      "reason": "full"
     },
     {
       "object": "LayoutTableCell TD id='secondCell'",
       "reason": "selection"
     },
     {
       "object": "LayoutText #text",
       "reason": "selection"
     },
     {
       "object": "InlineTextBox 'Second cell'",
       "reason": "selection"
     },
     {
       "object": "LayoutText #text",
-      "reason": "incremental"
+      "reason": "full"
     },
     {
       "object": "InlineTextBox 'Second cell'",
-      "reason": "incremental"
+      "reason": "full"
     }
   ]
 }