Add BubbleManager to manage bubbles and ChromeBubbleManager for events.

chrome/browser/ui/chrome_bubble_manager.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_CHROME_BUBBLE_MANAGER_H_
+#define CHROME_BROWSER_UI_CHROME_BUBBLE_MANAGER_H_
+
+#include "components/bubble/bubble_manager.h"
+
+class ChromeBubbleManager : public BubbleManager,
+                            public base::SupportsWeakPtr<ChromeBubbleManager> {
+ public:
+  ChromeBubbleManager();
+  ~ChromeBubbleManager() override;
+
+  void WindowFullscreenStateChanged();
+  void TabDeactivated();
+  void TabDetached();
+  void NavigationEntryCommitted();
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChromeBubbleManager);
+};
+
+#endif  // CHROME_BROWSER_UI_CHROME_BUBBLE_MANAGER_H_