Make sure CSS agent messages flush before testing.

third_party/WebKit/LayoutTests/http/tests/inspector/resource-tree/resources/script-navigated.js

Index: third_party/WebKit/LayoutTests/http/tests/inspector/resource-tree/resources/script-navigated.js
diff --git a/third_party/WebKit/LayoutTests/http/tests/inspector/resource-tree/resources/script-navigated.js b/third_party/WebKit/LayoutTests/http/tests/inspector/resource-tree/resources/script-navigated.js
index a064c9a36c2d1ad42aaddb4295d6959d6a5a164a..3bb937b84b64d50111ce58312c1b0fa438b302a8 100644
--- a/third_party/WebKit/LayoutTests/http/tests/inspector/resource-tree/resources/script-navigated.js
+++ b/third_party/WebKit/LayoutTests/http/tests/inspector/resource-tree/resources/script-navigated.js
@@ -1,4 +1,5 @@
 function foo() {
 }
-
-console.log("iframe loaded");
+requestAnimationFrame(() => {

[pfeldman, 2016/06/09 05:25:04]

We don't need a frame - all we need is a new task. setTimeout(, 0) would do.

For a real fix, we'd need to introduce a barrier that would trigger upon frame
load _and_ style recalc explicitly if we need recalc to be there.

+    console.log("iframe loaded");
+});