Add support for deferring app initialization when testing.

chrome/test/remoting/page_load_notification_observer.h

Index: chrome/test/remoting/page_load_notification_observer.h
diff --git a/chrome/test/remoting/page_load_notification_observer.h b/chrome/test/remoting/page_load_notification_observer.h
index 0a8890b60398738fb32b1819dd742840df85b761..391dd860272c9cf811fedf29feedf6025f0aa670 100644
--- a/chrome/test/remoting/page_load_notification_observer.h
+++ b/chrome/test/remoting/page_load_notification_observer.h
@@ -23,9 +23,16 @@ class PageLoadNotificationObserver
 
   ~PageLoadNotificationObserver() override;
 
+  void set_ignore_url_parameters(bool ignore_url_parameters) {
+    ignore_url_parameters_ = ignore_url_parameters;
+  }
+
  private:
   bool IsTargetLoaded();
+
   GURL target_;
+  bool ignore_url_parameters_;
+
   DISALLOW_COPY_AND_ASSIGN(PageLoadNotificationObserver);
 };