[MediaNotification] Add UMA to record user clicking media notifications

chrome/android/java/src/org/chromium/chrome/browser/document/ChromeLauncherActivity.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.document;
 
 import android.annotation.SuppressLint;
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.ActivityManager;
@@ skipping 31 matching lines @@
 import org.chromium.chrome.browser.IntentHandler.TabOpenType;
 import org.chromium.chrome.browser.ShortcutHelper;
 import org.chromium.chrome.browser.ShortcutSource;
 import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.WarmupManager;
 import org.chromium.chrome.browser.customtabs.CustomTabActivity;
 import org.chromium.chrome.browser.customtabs.CustomTabIntentDataProvider;
 import org.chromium.chrome.browser.customtabs.SeparateTaskCustomTabActivity;
 import org.chromium.chrome.browser.externalnav.IntentWithGesturesHandler;
 import org.chromium.chrome.browser.firstrun.FirstRunFlowSequencer;
+import org.chromium.chrome.browser.metrics.LaunchFromNotificationUMA;
 import org.chromium.chrome.browser.metrics.LaunchMetrics;
 import org.chromium.chrome.browser.metrics.StartupMetrics;
 import org.chromium.chrome.browser.multiwindow.MultiWindowUtils;
 import org.chromium.chrome.browser.notifications.NotificationUIManager;
 import org.chromium.chrome.browser.partnercustomizations.HomepageManager;
 import org.chromium.chrome.browser.partnercustomizations.PartnerBrowserCustomizations;
 import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
 import org.chromium.chrome.browser.preferences.DocumentModeManager;
 import org.chromium.chrome.browser.tab.Tab;
 import org.chromium.chrome.browser.tab.TabIdManager;
@@ skipping 915 matching lines @@
      */
     private void recordIntentMetrics() {
         Intent intent = getIntent();
         IntentHandler.ExternalAppId source =
                 IntentHandler.determineExternalIntentSource(getPackageName(), intent);
         if (intent.getPackage() == null && source != IntentHandler.ExternalAppId.CHROME) {
             int flagsOfInterest = Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_NEW_DOCUMENT;
             int maskedFlags = intent.getFlags() & flagsOfInterest;
             sIntentFlagsHistogram.record(maskedFlags);
         }
+        LaunchFromNotificationUMA.recordSource(intent);
     }
 }