Add a new SyncedTabDelegate for Android.

chrome/browser/sessions/session_tab_helper.h

Index: chrome/browser/sessions/session_tab_helper.h
diff --git a/chrome/browser/sessions/session_tab_helper.h b/chrome/browser/sessions/session_tab_helper.h
index 2fe66696dcf4d74fb0f23ae73d95e3bf70818c23..9279c0d278c2b699e2c48b4b390c56a8806a9e2f 100644
--- a/chrome/browser/sessions/session_tab_helper.h
+++ b/chrome/browser/sessions/session_tab_helper.h
@@ -17,6 +17,10 @@ class SessionTabHelper : public content::WebContentsObserver,
  public:
   virtual ~SessionTabHelper();
 
+  // Create for WebContents with identifier |id|.
+  static void CreateForWebContentsWithId(content::WebContents* contents,
+                                         const SessionID& id);
+
   // Returns the identifier used by session restore for this tab.
   const SessionID& session_id() const { return session_id_; }
 
@@ -36,7 +40,7 @@ class SessionTabHelper : public content::WebContentsObserver,
   // Unique identifier of the tab for session restore. This id is only unique
   // within the current session, and is not guaranteed to be unique across
   // sessions.
-  const SessionID session_id_;
+  SessionID session_id_;
 
   // Unique identifier of the window the tab is in.
   SessionID window_id_;