Add metrics to track Google Play install WebAPK failures.

chrome/android/java/src/org/chromium/chrome/browser/webapps/GooglePlayWebApkInstallDelegate.java

 // 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.
 
 package org.chromium.chrome.browser.webapps;
 
 import android.support.annotation.IntDef;
 
 import org.chromium.base.Callback;
 
@@ skipping 26 matching lines @@
      * @param version The version of WebAPK to install.
      * @param title The title of the WebAPK to display during installation.
      * @param token The token from WebAPK Minter Server.
      * @param url The start URL of the WebAPK to install.
      * @param callback The callback to invoke when the install completes, times out or fails.
      */
     void installAsync(String packageName, int version, String title, String token, String url,
             Callback<Integer> callback);
 
     /**
+     * Uses Google Play to update WebAPK asynchronously.
+     * @param packageName The package name of WebAPK to update.
+     * @param version The version of WebAPK to update.
+     * @param title The title of the WebAPK to display during update.
+     * @param token The token from WebAPK Minter Server.
+     * @param url The start URL of the WebAPK to update.
+     * @param callback The callback to invoke when the update completes, times out or fails.
+     */
+    void updateAsync(String packageName, int version, String title, String token, String url,
+            Callback<Integer> callback);

[pkotwicz, 2017/03/21 16:59:39]

This is already in ToT :)

[Xi Han, 2017/03/21 18:43:45]

Oh, yes, I didn't rebase it in time. It won't be in the new change patch.

+    /**
      * Calls the callback once the installation either succeeded or failed.
      * @param packageName The package name of WebAPK for the installation.
      * @param event The result of the install.
      */
     void onGotInstallEvent(String packageName, @InstallerPackageEvent int event);
 }