Create a RegisterViewAssociate method in ViewManager

services/ui/view_manager/tests/view_manager_test_base.h

+// Copyright 2016 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 "base/bind.h"
+#include "mojo/public/cpp/application/application_test_base.h"
+
+namespace view_manager {
+namespace test {
+
+const base::TimeDelta kDefaultMessageDelay =
+    base::TimeDelta::FromMilliseconds(10);
+
+// Run message loop until condition is true (timeout after 400*10ms = 4000ms)
+#define KICK_MESSAGE_LOOP_WHILE(x)     \
+  for (int i = 0; x && i < 400; i++) { \
+    KickMessageLoop();                 \
+  }
+
+class ViewManagerTestBase : public mojo::test::ApplicationTestBase {
+ public:
+  ViewManagerTestBase();
+  ~ViewManagerTestBase() override;
+
+  void SetUp() override;
+  void KickMessageLoop();
+
+ protected:
+  base::Closure quit_message_loop_callback_;
+  base::WeakPtrFactory<ViewManagerTestBase> weak_factory_;
+
+ private:
+  void QuitMessageLoopCallback();
+
+  DISALLOW_COPY_AND_ASSIGN(ViewManagerTestBase);
+};
+
+}  // namespace test
+}  // namespace view_manager