Do not submit: high level overview patch.

chrome/browser/sessions/session_tab_helper.cc

Index: chrome/browser/sessions/session_tab_helper.cc
diff --git a/chrome/browser/sessions/session_tab_helper.cc b/chrome/browser/sessions/session_tab_helper.cc
index 2314afdfe737314292971203a05a1e490ae6a90b..c57b8d11ef51004ac815d98e6a4e86849aae30d9 100644
--- a/chrome/browser/sessions/session_tab_helper.cc
+++ b/chrome/browser/sessions/session_tab_helper.cc
@@ -16,11 +16,16 @@
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(SessionTabHelper);
 
 SessionTabHelper::SessionTabHelper(content::WebContents* contents)
-    : content::WebContentsObserver(contents) {
-}
+    : content::WebContentsObserver(contents), sync_session_id_(-1) {}
+void SessionTabHelper::SetSessionId(const SessionID& id) { session_id_ = id; }
 
 SessionTabHelper::~SessionTabHelper() {
 }
+void SessionTabHelper::SetSessionSyncId(const int64 sync_id) {
+
+  DCHECK(sync_id >= -1);
+  sync_session_id_ = sync_id;
+}
 
 void SessionTabHelper::SetWindowID(const SessionID& id) {
   window_id_ = id;