Add Opt-in notification UMA for the Physical Web

chrome/android/java/src/org/chromium/chrome/browser/physicalweb/UrlManager.java

 // Copyright 2015 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.
 
 package org.chromium.chrome.browser.physicalweb;
 
 import android.app.Notification;
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
@@ skipping 259 matching lines @@
             }
         });
     }
 
     private void showNotification() {
         if (PhysicalWeb.isOnboarding(mContext)) {
             if (PhysicalWeb.getOptInNotifyCount(mContext) < PhysicalWeb.OPTIN_NOTIFY_MAX_TRIES) {
                 // high priority notification
                 createOptInNotification(true);
                 PhysicalWeb.recordOptInNotification(mContext);
+                PhysicalWebUma.onOptInHighPriorityNotificationShown(mContext);
             } else {
                 // min priority notification
                 createOptInNotification(false);
+                PhysicalWebUma.onOptInMinPriorityNotificationShown(mContext);
             }
             return;
         }
 
         if (PhysicalWeb.isPhysicalWebPreferenceEnabled(mContext)) {
             createNotification();
         }
     }
 
     private void createNotification() {
@@ skipping 41 matching lines @@
                 .setAutoCancel(true)
                 .build();
         mNotificationManager.notify(NotificationConstants.NOTIFICATION_ID_PHYSICAL_WEB,
                                     notification);
     }
 
     private void clearNotification() {
         mNotificationManager.cancel(NotificationConstants.NOTIFICATION_ID_PHYSICAL_WEB);
     }
 }