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"
+#include "content/public/browser/navigation_details.h"
+
+namespace content {
+class WebContents;
+}  // content
+
+class ChromeBubbleManager : public BubbleManager {

[please use gerrit instead, 2015/08/05 18:05:25]

Can ChromeBubbleManager implement content::WebContentsObserver itself instead of
introducing ChromeWebContentsObserver?

[hcarmona, 2015/08/05 18:43:47]

Is it possible to observe more than one web contents at the same time?

+ public:
+  ChromeBubbleManager();
+  ~ChromeBubbleManager() override;
+
+  void ListenToWebContents(content::WebContents* web_contents);
+
+  void FullscreenToggle(content::WebContents* context);
+  void TabBlur(content::WebContents* context);
+  void TabFocus(content::WebContents* context);
+  void TabDetached(content::WebContents* context);
+  void NavigationEntryCommitted(content::WebContents* context,
+                                const content::LoadCommittedDetails& details);
+  void WebContentsDestroyed(content::WebContents* context);
+};

[please use gerrit instead, 2015/08/05 18:05:25]

 private:
  DISALLOW_COPY_AND_ASSIGN(ChromeBubbleManager);

[hcarmona, 2015/08/06 17:43:44]

Done.

+
+#endif  // CHROME_BROWSER_UI_CHROME_BUBBLE_MANAGER_H_