Push API: Don't require notification if tab is visible.

chrome/browser/ui/android/tab_model/tab_model.h

 // Copyright (c) 2012 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_ANDROID_TAB_MODEL_TAB_MODEL_H_
 #define CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/sync/glue/synced_window_delegate.h"
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
@@ skipping 19 matching lines @@
 // with Android's Tabs and Tab Model.
 class TabModel : public content::NotificationObserver {
  public:
   virtual Profile* GetProfile() const;
   virtual bool IsOffTheRecord() const;
   virtual browser_sync::SyncedWindowDelegate* GetSyncedWindowDelegate() const;
   virtual SessionID::id_type GetSessionId() const;
 
   virtual int GetTabCount() const = 0;
   virtual int GetActiveIndex() const = 0;
+  virtual content::WebContents* GetActiveWebContents() const;
   virtual content::WebContents* GetWebContentsAt(int index) const = 0;
   // This will return NULL if the tab has not yet been initialized.
   virtual TabAndroid* GetTabAt(int index) const = 0;
 
   virtual void SetActiveIndex(int index) = 0;
   virtual void CloseTabAt(int index) = 0;
 
   // Used for restoring tabs from synced foreign sessions.
   virtual void CreateTab(content::WebContents* web_contents,
                          int parent_tab_id) = 0;
@@ skipping 35 matching lines @@
   // across sessions.
   SessionID session_id_;
 
   // The Registrar used to register TabModel for notifications.
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(TabModel);
 };
 
 #endif  // CHROME_BROWSER_UI_ANDROID_TAB_MODEL_TAB_MODEL_H_