Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

chrome/browser/ui/views/bubble/views_bubble_controller.h

+// Copyright 2015 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.
+
+#ifndef CHROME_BROWSER_UI_VIEWS_BUBBLE_VIEWS_BUBBLE_CONTROLLER_H_
+#define CHROME_BROWSER_UI_VIEWS_BUBBLE_VIEWS_BUBBLE_CONTROLLER_H_
+
+#include "components/bubble/bubble_controller.h"
+
+class ViewsBubbleController : public BubbleController {
+ public:
+  ViewsBubbleController(BubbleManager* manager, BubbleDelegate* delegate);
+  ~ViewsBubbleController() override {}
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_BUBBLE_VIEWS_BUBBLE_CONTROLLER_H_