Convert some repaint tests to not call display()

LayoutTests/fast/canvas/canvas-incremental-repaint.html

Index: LayoutTests/fast/canvas/canvas-incremental-repaint.html
diff --git a/LayoutTests/fast/canvas/canvas-incremental-repaint.html b/LayoutTests/fast/canvas/canvas-incremental-repaint.html
index d65c79f7e453ceb5c315af6e95108a2543d414f7..7e64d2e7678e098d8cd86c33c7be241c4f836779 100644
--- a/LayoutTests/fast/canvas/canvas-incremental-repaint.html
+++ b/LayoutTests/fast/canvas/canvas-incremental-repaint.html
@@ -10,25 +10,14 @@
       border: 20px solid black;
     }
   </style>
+  <script src="resources/repaint.js"></script>
   <script type="text/javascript" charset="utf-8">
 
     if (window.testRunner) {
       testRunner.dumpAsTextWithPixelResults();
-      testRunner.waitUntilDone();
     }
 
     var appleImage;
-    function runRepaintTest()
-    {
-        if (window.testRunner) {
-            document.body.offsetTop;
-            testRunner.display();
-            repaintTest();
-            testRunner.notifyDone();
-        } else {
-            setTimeout(repaintTest, 0);
-        }
-    }
     
     function initializeCanvas()
     {