Local NTP: Introduce OneGoogleBarService

chrome/browser/search/one_google_bar/one_google_bar_service_observer.h

Index: chrome/browser/search/one_google_bar/one_google_bar_service_observer.h
diff --git a/chrome/browser/search/one_google_bar/one_google_bar_service_observer.h b/chrome/browser/search/one_google_bar/one_google_bar_service_observer.h
new file mode 100644
index 0000000000000000000000000000000000000000..948023109622acd285e389f8e5d6f63514da9a6f
--- /dev/null
+++ b/chrome/browser/search/one_google_bar/one_google_bar_service_observer.h
@@ -0,0 +1,16 @@
+// Copyright 2017 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_SEARCH_ONE_GOOGLE_BAR_ONE_GOOGLE_BAR_SERVICE_OBSERVER_H_
+#define CHROME_BROWSER_SEARCH_ONE_GOOGLE_BAR_ONE_GOOGLE_BAR_SERVICE_OBSERVER_H_
+
+// Observer for OneGoogleBarService.
+class OneGoogleBarServiceObserver {
+ public:
+  // Called when the OneGoogleBarData changes. You can get the new data via
+  // OneGoogleBarService::one_google_bar_data().
+  virtual void OnOneGoogleBarDataChanged() = 0;
+};
+
+#endif  // CHROME_BROWSER_SEARCH_ONE_GOOGLE_BAR_ONE_GOOGLE_BAR_SERVICE_OBSERVER_H_