Attempt 2 to enable async data: URL loading.

content/test/frame_load_waiter.cc

Index: content/test/frame_load_waiter.cc
diff --git a/content/test/frame_load_waiter.cc b/content/test/frame_load_waiter.cc
new file mode 100644
index 0000000000000000000000000000000000000000..6343f8523f010c4a5d8a5d787215167b50c8c46c
--- /dev/null
+++ b/content/test/frame_load_waiter.cc
@@ -0,0 +1,27 @@
+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/test/frame_load_waiter.h"
+
+#include "base/location.h"
+#include "base/message_loop/message_loop.h"
+
+namespace content {
+
+FrameLoadWaiter::FrameLoadWaiter(RenderFrame* frame)
+    : RenderFrameObserver(frame) {
+}
+
+void FrameLoadWaiter::Wait() {
+  // Pump messages until Blink's threaded HTML parser finishes.
+  run_loop_.Run();
+}
+
+void FrameLoadWaiter::DidFinishLoad() {
+  // Post a task to quit instead of quitting directly, since the load completion
+  // may trigger other IPCs that tests are expecting.
+  base::MessageLoop::current()->PostTask(FROM_HERE, run_loop_.QuitClosure());
+}
+
+}  // namespace content