NTP: Fix metrics recording race condition

chrome/browser/android/ntp/most_visited_sites_bridge.h

 // Copyright 2016 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_ANDROID_NTP_MOST_VISITED_SITES_BRIDGE_H_
 #define CHROME_BROWSER_ANDROID_NTP_MOST_VISITED_SITES_BRIDGE_H_
 
 #include <jni.h>
 #include <stddef.h>
 
@@ skipping 29 matching lines @@
       jboolean add_url);
   void RecordTileTypeMetrics(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       const base::android::JavaParamRef<jintArray>& jtile_types,
       const base::android::JavaParamRef<jintArray>& jsources);
   void RecordOpenedMostVisitedItem(
       JNIEnv* env,
       const base::android::JavaParamRef<jobject>& obj,
       jint index,
-      jint tile_type);
+      jint tile_type,
+      jint source);
 
   // Registers JNI methods.
   static bool Register(JNIEnv* env);
 
  private:
   ~MostVisitedSitesBridge();
 
   class JavaObserver;
   std::unique_ptr<JavaObserver> java_observer_;
 
@@ skipping 18 matching lines @@
         register_observer_;
   };
   SupervisorBridge supervisor_;
 
   ntp_tiles::MostVisitedSites most_visited_;
 
   DISALLOW_COPY_AND_ASSIGN(MostVisitedSitesBridge);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_NTP_MOST_VISITED_SITES_BRIDGE_H_