Do not submit: high level overview patch.

chrome/browser/android/tab_android.h

Index: chrome/browser/android/tab_android.h
diff --git a/chrome/browser/android/tab_android.h b/chrome/browser/android/tab_android.h
index 46edfc58cf83dfc4220c184d337ae07325978dc5..7d514ed17a90ac630b84f400aa27e5f7ec276adc 100644
--- a/chrome/browser/android/tab_android.h
+++ b/chrome/browser/android/tab_android.h
@@ -10,6 +10,7 @@
 #include "base/android/jni_helper.h"
 #include "base/callback_forward.h"
 #include "base/string16.h"
+#include "chrome/browser/sessions/session_id.h"
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
 
 class GURL;
@@ -39,11 +40,12 @@ class TabAndroid {
 
   virtual browser_sync::SyncedTabDelegate* GetSyncedTabDelegate() = 0;
 
+  virtual int64 GetSyncSessionId() = 0;
+  virtual void SetSyncSessionId(int64 sync_id) = 0;
+
   virtual ToolbarModel::SecurityLevel GetSecurityLevel();
 
-  int id() const {
-    return tab_id_;
-  }
+  const SessionID& id() const { return tab_id_; }
 
   virtual void OnReceivedHttpAuthRequest(jobject auth_handler,
                                          const string16& host,
@@ -81,7 +83,7 @@ class TabAndroid {
   static content::WebContents* InitWebContentsFromView(JNIEnv* env,
                                                        jobject content_view);
 
-  int tab_id_;
+  SessionID tab_id_;
 
  private:
   JavaObjectWeakGlobalRef weak_java_tab_;