[Sync] Add tests for migration triggered by notifications

chrome/test/live_sync/live_sync_test.h

Index: chrome/test/live_sync/live_sync_test.h
diff --git a/chrome/test/live_sync/live_sync_test.h b/chrome/test/live_sync/live_sync_test.h
index f9f9b15880f6bc88e4db1361633095b0d8670087..0a509fd03f4b8b7a6119adc48cdda575da7348cc 100644
--- a/chrome/test/live_sync/live_sync_test.h
+++ b/chrome/test/live_sync/live_sync_test.h
@@ -136,15 +136,23 @@ class LiveSyncTest : public InProcessBrowserTest {
   // Checks if the datatype |type| is encrypted for profile |index|.
   bool IsEncrypted(int index, syncable::ModelType type);
 
-  // Disable notifications for the current test.  Must be called
-  // before the test server is started (i.e., before either of
-  // SetupSync() or SetupClients() is called).
-  void DisableNotifications();
-
   // Blocks until all sync clients have completed their mutual sync cycles.
   // Returns true if a quiescent state was successfully reached.
   bool AwaitQuiescence();
 
+  // Returns true if the server being used supports controlling
+  // notifications.
+  bool ServerSupportsNotificationControl();
+
+  // Disable notifications on the server.  This operation is available
+  // only if ServerSupportsNotificationControl() returned true.
+  void DisableNotifications();
+
+  // Trigger a notification to be sent to all clients.  This operation
+  // is available only if ServerSupportsNotificationControl() returned
+  // true.
+  void TriggerNotification(const syncable::ModelTypeSet& changed_types);
+
   // Returns true if the server being used supports injecting errors.
   bool ServerSupportsErrorTriggering();
 
@@ -296,9 +304,6 @@ class LiveSyncTest : public InProcessBrowserTest {
   // URLFetcher factory used to contact sync server.
   scoped_ptr<URLFetcherFactory> integration_factory_;
 
-  // Whether or not to use notifications for the current test.
-  bool enable_notifications_;
-
   DISALLOW_COPY_AND_ASSIGN(LiveSyncTest);
 };