Add a new SyncedTabDelegate for Android.

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..710e316f08bccf489f2ad4b3b8c8504844bab8d4 100644
--- a/chrome/browser/sessions/session_tab_helper.cc
+++ b/chrome/browser/sessions/session_tab_helper.cc
@@ -19,9 +19,24 @@ SessionTabHelper::SessionTabHelper(content::WebContents* contents)
     : content::WebContentsObserver(contents) {
 }
 
-SessionTabHelper::~SessionTabHelper() {
+SessionTabHelper::SessionTabHelper(content::WebContents* contents,
+                                   const SessionID& id)
+    : content::WebContentsObserver(contents), session_id_(id) {}

[sky, 2013/05/22 00:46:36]

nit: since the constructor wrapped one param on each line.

+
+// static
+void SessionTabHelper::CreateForWebContentsWithId(
+    content::WebContents* contents,
+    const SessionID& id) {
+  DCHECK(contents);
+  if (FromWebContents(contents)) {
+    DCHECK_EQ(id.id(), FromWebContents(contents)->session_id().id());
+    return;
+  }
+  contents->SetUserData(UserDataKey(), new SessionTabHelper(contents, id));
 }
 
+SessionTabHelper::~SessionTabHelper() {}
+
 void SessionTabHelper::SetWindowID(const SessionID& id) {
   window_id_ = id;