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 "chrome/browser/ui/tabs/tab_strip_model_observer.h"
+#include "components/bubble/bubble_manager.h"
+#include "content/public/browser/web_contents_observer.h"
+
+class TabStripModel;
+
+class ChromeBubbleManager : public BubbleManager,
+                            public TabStripModelObserver,
+                            public content::WebContentsObserver {
+ public:
+  explicit ChromeBubbleManager(TabStripModel* tab_strip_model);
+  ~ChromeBubbleManager() override;
+
+  // TabStripModelObserver:
+  void TabDetachedAt(content::WebContents* contents, int index) override;
+  void TabDeactivated(content::WebContents* contents) override;
+  void ActiveTabChanged(content::WebContents* old_contents,
+                        content::WebContents* new_contents,
+                        int index,
+                        int reason) override;
+
+  // WebContentsObserver:

[msw, 2015/08/26 20:29:09]

nit: "content::" prefix.

[hcarmona, 2015/08/26 20:52:28]

Done.

+  void DidToggleFullscreenModeForTab(bool entered_fullscreen) override;
+  void NavigationEntryCommitted(
+      const content::LoadCommittedDetails& load_details) override;
+
+ private:
+  TabStripModel* tab_strip_model_;
+
+  DISALLOW_COPY_AND_ASSIGN(ChromeBubbleManager);
+};
+
+#endif  // CHROME_BROWSER_UI_CHROME_BUBBLE_MANAGER_H_