Remove testRunner.display() from most compositing/ tests

LayoutTests/compositing/video-frame-size-change.html

Index: LayoutTests/compositing/video-frame-size-change.html
diff --git a/LayoutTests/compositing/video-frame-size-change.html b/LayoutTests/compositing/video-frame-size-change.html
index 8fd0281c973f79923a2fe26b293c5f7f5787c162..801a33b99bf5b9c4f4aa97354ad909e39bd1ebf5 100644
--- a/LayoutTests/compositing/video-frame-size-change.html
+++ b/LayoutTests/compositing/video-frame-size-change.html
@@ -16,10 +16,9 @@
                         return;
                     }
                     // Make sure we render the first frame.
-                    if (window.testRunner) {
-                        testRunner.display();
-                    }
-                    video.play();
+                    requestAnimationFrame(function() {
+                        video.play();
+                    });
                 };
 
                 // Get the first video to stay on frame zero for comparison purposes.