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..c1185947f822113a5249b14c6cbe279303aa09a1 100644
--- a/chrome/browser/sessions/session_tab_helper.cc
+++ b/chrome/browser/sessions/session_tab_helper.cc
@@ -19,9 +19,26 @@ SessionTabHelper::SessionTabHelper(content::WebContents* contents)
     : content::WebContentsObserver(contents) {
 }
 
-SessionTabHelper::~SessionTabHelper() {
+SessionTabHelper::SessionTabHelper(content::WebContents* contents,
+                                   const SessionID& id)
+    : content::WebContentsObserver(contents),
+      session_id_(id) {
 }
 
+// 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;