Add a new SyncedTabDelegate for Android.

chrome/browser/sync/glue/synced_tab_delegate_android.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2013 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_SYNC_TAB_CONTENTS_SYNCED_TAB_DELEGATE_H_
-#define CHROME_BROWSER_UI_SYNC_TAB_CONTENTS_SYNCED_TAB_DELEGATE_H_
+#ifndef CHROME_BROWSER_SYNC_GLUE_SYNCED_TAB_DELEGATE_ANDROID_H_
+#define CHROME_BROWSER_SYNC_GLUE_SYNCED_TAB_DELEGATE_ANDROID_H_
 
 #include "base/compiler_specific.h"
-#include "chrome/browser/sessions/session_id.h"
 #include "chrome/browser/sync/glue/synced_tab_delegate.h"
 #include "content/public/browser/web_contents_user_data.h"
 
 namespace content {
 class WebContents;
 }
 
-class TabContentsSyncedTabDelegate
-    : public browser_sync::SyncedTabDelegate,
-      public content::WebContentsUserData<TabContentsSyncedTabDelegate> {
+class TabAndroid;
+// On Android a tab can exist even without web contents.
+
+// SyncedTabDelegateAndroid wraps TabContentsSyncedTabDelegate and provides
+// a method to set web contents later when tab is brought to memory.
+class SyncedTabDelegateAndroid : public browser_sync::SyncedTabDelegate {
  public:
-  virtual ~TabContentsSyncedTabDelegate();
+  explicit SyncedTabDelegateAndroid(TabAndroid* owning_tab_);
+  virtual ~SyncedTabDelegateAndroid();
 
   // Methods from SyncedTabDelegate.
   virtual SessionID::id_type GetWindowId() const OVERRIDE;
   virtual SessionID::id_type GetSessionId() const OVERRIDE;
   virtual bool IsBeingDestroyed() const OVERRIDE;
   virtual Profile* profile() const OVERRIDE;
   virtual std::string GetExtensionAppId() const OVERRIDE;
   virtual int GetCurrentEntryIndex() const OVERRIDE;
   virtual int GetEntryCount() const OVERRIDE;
   virtual int GetPendingEntryIndex() const OVERRIDE;
   virtual content::NavigationEntry* GetPendingEntry() const OVERRIDE;
   virtual content::NavigationEntry* GetEntryAtIndex(int i) const OVERRIDE;
   virtual content::NavigationEntry* GetActiveEntry() const OVERRIDE;
+  virtual bool IsPinned() const OVERRIDE;
+  virtual bool HasWebContents() const OVERRIDE;
+
+  // Managed user related methods.
+
   virtual bool ProfileIsManaged() const OVERRIDE;
   virtual const std::vector<const content::NavigationEntry*>*
       GetBlockedNavigations() const OVERRIDE;
-  virtual bool IsPinned() const OVERRIDE;
+
+  // Set the web contents for this tab. Also creates
+  // TabContentsSyncedTabDelegate for this tab.
+  virtual void SetWebContents(content::WebContents* web_contents);
+  // Set web contents to null.
+  virtual void ResetWebContents();
 
  private:
-  explicit TabContentsSyncedTabDelegate(content::WebContents* web_contents);
-  friend class content::WebContentsUserData<TabContentsSyncedTabDelegate>;
+  content::WebContents* web_contents_;
+  TabAndroid* tab_android_;
 
-  content::WebContents* web_contents_;
-
-  DISALLOW_COPY_AND_ASSIGN(TabContentsSyncedTabDelegate);
+  DISALLOW_COPY_AND_ASSIGN(SyncedTabDelegateAndroid);
 };
 
-#endif  // CHROME_BROWSER_UI_SYNC_TAB_CONTENTS_SYNCED_TAB_DELEGATE_H_
+#endif  // CHROME_BROWSER_SYNC_GLUE_SYNCED_TAB_DELEGATE_ANDROID_H_