Incrementally invalidate boxes with borders if possible

LayoutTests/fast/repaint/resize-with-border.html

Index: LayoutTests/fast/repaint/resize-with-border.html
diff --git a/LayoutTests/fast/repaint/resize-with-border.html b/LayoutTests/fast/repaint/resize-with-border.html
index 506fb250e1e905a3198532966e5e1930c3769558..c24dafb894e171c9e3e3a5d99b8183b954cf2840 100644
--- a/LayoutTests/fast/repaint/resize-with-border.html
+++ b/LayoutTests/fast/repaint/resize-with-border.html
@@ -11,10 +11,18 @@ window.onload = runRepaintTest;
 body {
     margin: 0;
 }
-div {
+#div {
+    position: absolute;
+    top: 100px;
+    left: 100px;
     width: 200px;
     height: 200px;
     border: green 10px solid;
 }
 </style>
+<div>
+Tests repaint when a box with border is resized.
+Passes if the result paint rects cover all changed part,
+the new border is correctly drawn and there is no residue of the old border.
+</div>
 <div id="div"></div>