Create an Obj-C bridge for MostVisitedSitesObserver

ios/chrome/browser/ntp_tiles/most_visited_sites_observer_bridge.mm

Index: ios/chrome/browser/ntp_tiles/most_visited_sites_observer_bridge.mm
diff --git a/ios/chrome/browser/ntp_tiles/most_visited_sites_observer_bridge.mm b/ios/chrome/browser/ntp_tiles/most_visited_sites_observer_bridge.mm
new file mode 100644
index 0000000000000000000000000000000000000000..7128e6edda83afa12f7a0d4d807cb59c7b1c5d93
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+++ b/ios/chrome/browser/ntp_tiles/most_visited_sites_observer_bridge.mm
@@ -0,0 +1,25 @@
+// 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 "ios/chrome/browser/ntp_tiles/most_visited_sites_observer_bridge.h"
+
+namespace ntp_tiles {
+
+MostVisitedSitesObserverBridge::MostVisitedSitesObserverBridge(
+    id<MostVisitedSitesObserving> observer) {
+  observer_.reset(observer);
+}
+
+MostVisitedSitesObserverBridge::~MostVisitedSitesObserverBridge() {}
+
+void MostVisitedSitesObserverBridge::OnMostVisitedURLsAvailable(
+    const NTPTilesVector& most_visited) {
+  [observer_ onMostVisitedURLsAvailable:most_visited];
+}
+
+void MostVisitedSitesObserverBridge::OnIconMadeAvailable(const GURL& site_url) {
+  [observer_ onIconMadeAvailable:site_url];
+}
+
+}  // namespace ntp_tiles