Adjust for composited scrolling when invalidating paint rectangles.

third_party/WebKit/LayoutTests/paint/invalidation/caret-with-composited-scroll-expected.txt

 {
   "bounds": [800, 600],
   "children": [
     {
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
       "children": [
         {
-          "position": [10, 60],
-          "bounds": [700, 400],
+          "position": [8, 48],
+          "bounds": [100, 100],
           "shouldFlattenTransform": false,
           "drawsContent": true,
           "children": [
             {
-              "bounds": [685, 385],
+              "bounds": [100, 100],
               "shouldFlattenTransform": false,
               "children": [
                 {
-                  "bounds": [685, 600],
+                  "bounds": [205, 1022],
                   "drawsContent": true,
                   "paintInvalidations": [
                     {
-                      "object": "LayoutBlockFlow (positioned) DIV id='block'",
-                      "rect": [300, 200, 120, 50],
-                      "reason": "bounds change"
+                      "object": "LayoutTextControl INPUT id='text'",
+                      "rect": [-1, 999, 207, 24],
+                      "reason": "subtree"
                     },
                     {
-                      "object": "LayoutBlockFlow (positioned) DIV id='block'",
-                      "rect": [50, 200, 120, 50],
-                      "reason": "bounds change"
+                      "object": "LayoutBlockFlow DIV id='inner-editor'",
+                      "rect": [3, 1003, 200, 16],
+                      "reason": "subtree"
+                    },
+                    {
+                      "object": "LayoutBlockFlow DIV id='inner-editor'",
+                      "rect": [2, 1002, 3, 18],
+                      "reason": "invalidate paint rectangle"
                     }
                   ]
                 }
               ]
             },
             {
-              "bounds": [700, 400],
+              "bounds": [100, 100],
               "children": [
                 {
-                  "position": [0, 385],
-                  "bounds": [685, 15]
+                  "position": [0, 100],
+                  "bounds": [100, 0],
+                  "drawsContent": true
                 },
                 {
-                  "position": [685, 0],
-                  "bounds": [15, 385],
+                  "position": [100, 0],
+                  "bounds": [0, 100],
+                  "drawsContent": true,
                   "paintInvalidations": [
                     {
                       "object": "Vertical Scrollbar Layer",
-                      "rect": [0, 0, 15, 385],
                       "reason": "full"
                     }
                   ]
-                },
-                {
-                  "position": [685, 385],
-                  "bounds": [15, 15],
-                  "drawsContent": true
                 }
               ]
             }
           ]
         }
       ]
     }
   ]
 }