Add integraton test for sync backup/rollback.

chrome/browser/sync/profile_sync_service.h

Index: chrome/browser/sync/profile_sync_service.h
diff --git a/chrome/browser/sync/profile_sync_service.h b/chrome/browser/sync/profile_sync_service.h
index 14882ba117b5887c6f755511dd61ff34c8885425..5e6f1cca8b93002e540a76c8fa899c57188f0d3e 100644
--- a/chrome/browser/sync/profile_sync_service.h
+++ b/chrome/browser/sync/profile_sync_service.h
@@ -766,6 +766,10 @@ class ProfileSyncService : public ProfileSyncServiceBase,
     return backend_mode_;
   }
 
+  bool is_syncing() const {

[rlarocque, 2014/06/03 22:59:48]

How does this differ from ShouldPushChanges()?

[haitaol1, 2014/06/04 18:21:30]

That should work too. Removed this.

On 2014/06/03 22:59:48, rlarocque wrote:

+    return is_syncing_;
+  }
+
  protected:
   // Helper to configure the priority data types.
   void ConfigurePriorityDataTypes();
@@ -968,6 +972,9 @@ class ProfileSyncService : public ProfileSyncServiceBase,
   // Whether the SyncBackendHost has been initialized.
   bool backend_initialized_;
 
+  // Whether StartSyncingWithServer() has been called.
+  bool is_syncing_;
+
   // Set when sync receives DISABLED_BY_ADMIN error from server. Prevents
   // ProfileSyncService from starting backend till browser restarted or user
   // signed out.