Create an Obj-C bridge for MostVisitedSitesObserver

components/ntp_tiles/ios/most_visited_sites_bridge_observer.mm

Index: components/ntp_tiles/ios/most_visited_sites_bridge_observer.mm
diff --git a/components/ntp_tiles/ios/most_visited_sites_bridge_observer.mm b/components/ntp_tiles/ios/most_visited_sites_bridge_observer.mm
new file mode 100644
index 0000000000000000000000000000000000000000..839cbe0bd03e12e4f52076feac6396ad8fd36aef
--- /dev/null
+++ b/components/ntp_tiles/ios/most_visited_sites_bridge_observer.mm
@@ -0,0 +1,27 @@
+// 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.
+
+#import "components/ntp_tiles/ios/most_visited_sites_bridge_observer.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace ntp_tiles {
+
+MostVisitedSitesBridge::MostVisitedSitesBridge(
+    id<MostVisitedSitesObserver> observer) {
+  observer_ = observer;
+}
+
+void MostVisitedSitesBridge::OnMostVisitedURLsAvailable(
+    const NTPTilesVector& most_visited) {
+  [observer_ onMostVisitedURLsAvailable:most_visited];
+}
+
+void MostVisitedSitesBridge::OnIconMadeAvailable(const GURL& site_url) {
+  [observer_ onIconMadeAvailable:site_url];
+}
+
+}  // namespace ntp_tiles