Init WebApkUpdateManager with a WebappDataStorage to avoid null object.

chrome/android/javatests/src/org/chromium/chrome/browser/webapps/WebApkUpdateManagerTest.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.content.Context;
 import android.support.test.filters.MediumTest;
 
 import org.chromium.base.ThreadUtils;
@@ skipping 41 matching lines @@
     private Tab mTab;
 
     /**
      * Subclass of {@link WebApkUpdateManager} which notifies the {@link CallbackHelper} passed to
      * the constructor when it has been determined whether an update is needed.
      */
     private static class TestWebApkUpdateManager extends WebApkUpdateManager {
         private CallbackHelper mWaiter;
         private boolean mNeedsUpdate = false;
 
-        public TestWebApkUpdateManager(CallbackHelper waiter) {
-            super(null);
+        public TestWebApkUpdateManager(CallbackHelper waiter, WebappDataStorage storage) {
+            super(null, storage);
             mWaiter = waiter;
         }
 
         @Override
         public void onWebManifestForInitialUrlNotWebApkCompatible() {
             super.onWebManifestForInitialUrlNotWebApkCompatible();
             mWaiter.notifyCalled();
         }
 
         @Override
@@ skipping 66 matching lines @@
     }
 
     @Override
     public void startMainActivity() throws InterruptedException {
         startMainActivityOnBlankPage();
     }
 
      /** Checks whether a WebAPK update is needed. */
     private boolean checkUpdateNeeded(final CreationData creationData) throws Exception {
         CallbackHelper waiter = new CallbackHelper();
-        final TestWebApkUpdateManager updateManager = new TestWebApkUpdateManager(waiter);
+        WebappDataStorage storage = WebappRegistry.getInstance().getWebappDataStorage(WEBAPK_ID);
+        final TestWebApkUpdateManager updateManager = new TestWebApkUpdateManager(waiter, storage);
 
         ThreadUtils.runOnUiThreadBlocking(new Runnable() {
             @Override
             public void run() {
                 WebApkInfo info = WebApkInfo.create(WEBAPK_ID, "", creationData.scope, null,
                         creationData.name, creationData.shortName, creationData.displayMode,
                         creationData.orientation, 0, creationData.themeColor,
                         creationData.backgroundColor, "", WebApkVersion.CURRENT_SHELL_APK_VERSION,
                         creationData.manifestUrl, creationData.startUrl,
                         creationData.iconUrlToMurmur2HashMap);
@@ skipping 33 matching lines @@
         // URL canonicalization should replace "%62" with 'b'.
         CreationData creationData = defaultCreationData(mTestServer);
         creationData.startUrl = mTestServer.getURL(
                 "/chrome/test/data/banners/manifest_%62est_page.html");
 
         WebappTestPage.navigateToPageWithServiceWorkerAndManifest(
                 mTestServer, mTab, WEBAPK_MANIFEST_URL);
         assertTrue(checkUpdateNeeded(creationData));
     }
 }