[Sync] Add support for identifying tabbed activites

chrome/browser/sync/glue/synced_window_delegate_android.h

Index: chrome/browser/sync/glue/synced_window_delegate_android.h
diff --git a/chrome/browser/sync/glue/synced_window_delegate_android.h b/chrome/browser/sync/glue/synced_window_delegate_android.h
index 0db172c7b4dd23b0a519f7ef7e63fbb28195d566..0d31d12f2c8e60211027ea3e70be0e2d0050d93b 100644
--- a/chrome/browser/sync/glue/synced_window_delegate_android.h
+++ b/chrome/browser/sync/glue/synced_window_delegate_android.h
@@ -20,7 +20,7 @@ namespace browser_sync {
 
 class SyncedWindowDelegateAndroid : public sync_sessions::SyncedWindowDelegate {
  public:
-  explicit SyncedWindowDelegateAndroid(TabModel* tab_model);
+  SyncedWindowDelegateAndroid(TabModel* tab_model, bool is_tabbed_activity);
   ~SyncedWindowDelegateAndroid() override;
 
   // sync_sessions::SyncedWindowDelegate implementation.
@@ -39,6 +39,7 @@ class SyncedWindowDelegateAndroid : public sync_sessions::SyncedWindowDelegate {
 
  private:
   TabModel* tab_model_;
+  const bool is_tabbed_activity_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(SyncedWindowDelegateAndroid);
 };