Fix selection invalidation in composited scrollers.

LayoutTests/paint/selection/selection-within-composited-scroller-expected.txt

Index: LayoutTests/paint/selection/selection-within-composited-scroller-expected.txt
diff --git a/LayoutTests/platform/win/compositing/overflow/updating-scrolling-content-expected.txt b/LayoutTests/paint/selection/selection-within-composited-scroller-expected.txt
similarity index 67%
copy from LayoutTests/platform/win/compositing/overflow/updating-scrolling-content-expected.txt
copy to LayoutTests/paint/selection/selection-within-composited-scroller-expected.txt
index 540be7bf1d39f420565c484e0fb2c6ec0ffe6108..6e6942a2541ef24f773ff5aa336fced8a35b0e18 100644
--- a/LayoutTests/platform/win/compositing/overflow/updating-scrolling-content-expected.txt
+++ b/LayoutTests/paint/selection/selection-within-composited-scroller-expected.txt
@@ -5,30 +5,42 @@
       "bounds": [800, 600],
       "contentsOpaque": true,
       "drawsContent": true,
+      "paintInvalidationClients": [
+        "LayoutBlockFlow HTML",
+        "LayoutBlockFlow BODY"
+      ],
       "children": [
         {
           "position": [8, 8],
           "bounds": [200, 200],
+          "contentsOpaque": true,
           "drawsContent": true,
+          "backgroundColor": "#D3D3D3",
           "repaintRects": [
-            [0, 0, 185, 200]
+            [0, 160, 21, 19]
           ],
           "paintInvalidationClients": [
-            "LayoutBlockFlow DIV id='indicator'"
+            "LayoutBlockFlow DIV id='scroller'",
+            "LayoutBlockFlow DIV id='target'",
+            "LayoutText #text",
+            "InlineTextBox 'test'"
           ],
           "children": [
             {
               "bounds": [185, 185],
               "children": [
                 {
-                  "bounds": [185, 1200],
+                  "bounds": [200, 1620],
                   "shouldFlattenTransform": false,
                   "drawsContent": true,
                   "repaintRects": [
-                    [0, 0, 185, 200]
+                    [0, 610, 21, 19]
                   ],
                   "paintInvalidationClients": [
-                    "LayoutBlockFlow DIV id='indicator'"
+                    "LayoutBlockFlow DIV id='scroller'",
+                    "LayoutBlockFlow DIV id='target'",
+                    "LayoutText #text",
+                    "InlineTextBox 'test'"
                   ],
                   "children": [
                     {
@@ -48,13 +60,7 @@
                 {
                   "position": [185, 0],
                   "bounds": [15, 185],
-                  "drawsContent": true,
-                  "repaintRects": [
-                    [0, 0, 15, 185]
-                  ],
-                  "paintInvalidationClients": [
-                    "##ALL##"
-                  ]
+                  "drawsContent": true
                 },
                 {
                   "position": [185, 185],