Do not submit: high level overview patch.

chrome/browser/ui/sync/tab_contents_synced_tab_delegate.cc

 // 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.
 
 #include "chrome/browser/ui/sync/tab_contents_synced_tab_delegate.h"
 
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/tab_helper.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/session_tab_helper.h"
 #include "chrome/browser/sync/glue/synced_window_delegate.h"
 #include "chrome/common/extensions/extension.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents.h"
 
 using content::NavigationEntry;
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(TabContentsSyncedTabDelegate);
 
 TabContentsSyncedTabDelegate::TabContentsSyncedTabDelegate(
     content::WebContents* web_contents)
         : web_contents_(web_contents) {}
 
 TabContentsSyncedTabDelegate::~TabContentsSyncedTabDelegate() {}
 
-SessionID::id_type TabContentsSyncedTabDelegate::GetWindowId() const {
-  return SessionTabHelper::FromWebContents(web_contents_)->window_id().id();
+const SessionID& TabContentsSyncedTabDelegate::GetWindowId() const {
+  return SessionTabHelper::FromWebContents(web_contents_)->window_id();
 }
 
-SessionID::id_type TabContentsSyncedTabDelegate::GetSessionId() const {
-  return SessionTabHelper::FromWebContents(web_contents_)->session_id().id();
+const SessionID& TabContentsSyncedTabDelegate::GetSessionId() const {
+  return SessionTabHelper::FromWebContents(web_contents_)->session_id();
+}
+
+int64 TabContentsSyncedTabDelegate::GetSyncSessionId() const {
+  return SessionTabHelper::FromWebContents(web_contents_)->GetSessionSyncId();
+}
+
+void TabContentsSyncedTabDelegate::SetSyncSessionId(const int64 sync_id) {
+  SessionTabHelper::FromWebContents(web_contents_)->SetSessionSyncId(sync_id);
 }
 
 bool TabContentsSyncedTabDelegate::IsBeingDestroyed() const {
   return web_contents_->IsBeingDestroyed();
 }
 
 Profile* TabContentsSyncedTabDelegate::profile() const {
   return Profile::FromBrowserContext(web_contents_->GetBrowserContext());
 }
 
@@ skipping 23 matching lines @@
   return web_contents_->GetController().GetEntryAtIndex(i);
 }
 
 NavigationEntry* TabContentsSyncedTabDelegate::GetActiveEntry() const {
   return web_contents_->GetController().GetActiveEntry();
 }
 
 bool TabContentsSyncedTabDelegate::IsPinned() const {
   const browser_sync::SyncedWindowDelegate* window =
       browser_sync::SyncedWindowDelegate::FindSyncedWindowDelegateWithId(
-          GetWindowId());
+          GetWindowId().id());
   // We might not have a parent window, e.g. Developer Tools.
   return window ? window->IsTabPinned(this) : false;
 }
+
+bool TabContentsSyncedTabDelegate::IsTabInMemory() const { return true; }