Add a chrome://webapks page.

chrome/android/java/src/org/chromium/chrome/browser/webapps/WebApkInfo.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.Intent;
 import android.content.pm.ApplicationInfo;
 import android.content.pm.PackageManager;
 import android.content.res.Resources;
@@ skipping 37 matching lines @@
      */
     public static WebApkInfo create(Intent intent) {
         String webApkPackageName =
                 IntentUtils.safeGetStringExtra(intent, ShortcutHelper.EXTRA_WEBAPK_PACKAGE_NAME);
         if (TextUtils.isEmpty(webApkPackageName)) {
             return null;
         }
 
         String url = urlFromIntent(intent);
         int source = sourceFromIntent(intent);
+        return create(webApkPackageName, url, source);
+    }
 
+    /**
+     * Constructs a WebApkInfo from the passed in parameters and <meta-data> in the WebAPK's Android
+     * manifest.
+     *
+     * @param webApkPackageName The package name of the WebAPK.
+     * @param url Url that the WebAPK should navigate to when launched.
+     * @param source Source that the WebAPK was launched from.
+     */
+    public static WebApkInfo create(String webApkPackageName, String url, int source) {
         // Unlike non-WebAPK web apps, WebAPK ids are predictable. A malicious actor may send an
         // intent with a valid start URL and arbitrary other data. Only use the start URL, the
         // package name and the ShortcutSource from the launch intent and extract the remaining data
         // from the <meta-data> in the WebAPK's Android manifest.
 
         Bundle bundle = extractWebApkMetaData(webApkPackageName);
         if (bundle == null) {
             return null;
         }
 
@@ skipping 270 matching lines @@
             return ScreenOrientationValues.PORTRAIT;
         } else if (orientation.equals("portrait-primary")) {
             return ScreenOrientationValues.PORTRAIT_PRIMARY;
         } else if (orientation.equals("portrait-secondary")) {
             return ScreenOrientationValues.PORTRAIT_SECONDARY;
         } else {
             return ScreenOrientationValues.DEFAULT;
         }
     }
 }