Bug 575336 part 3. Change the reftest harness to do its initial flush on all subframes, not just the root one. r=roc

layout/tools/reftest/reftest.js

@@ -851,8 +851,17 @@ function OnDocumentLoad(event)
             .getInterface(CI.nsIDOMWindowUtils);
 
         function FlushRendering() {
+            function flushWindow(win) {
+                try {
+                    win.document.documentElement.getBoundingClientRect();
+                } catch (e) {}
+                for (var i = 0; i < win.frames.length; ++i) {
+                    flushWindow(win.frames[i]);
+                }
+            }
+                
             // Flush pending restyles and reflows
-            contentRootElement.getBoundingClientRect();
+            flushWindow(contentRootElement.ownerDocument.defaultView);
             // Flush out invalidation
             utils.processUpdates();
         }