Move native "enable-webapk" check to ChromeWebApkHost.

chrome/android/java/src/org/chromium/chrome/browser/webapps/ChromeWebApkHost.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.os.StrictMode;
 
 import org.chromium.base.CommandLine;
 import org.chromium.base.ContextUtils;
 import org.chromium.base.FieldTrialList;
 import org.chromium.base.Log;
+import org.chromium.base.annotations.CalledByNative;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.preferences.ChromePreferenceManager;
 import org.chromium.webapk.lib.client.WebApkValidator;
 
 /**
  * Contains functionality needed for Chrome to host WebAPKs.
  */
 public class ChromeWebApkHost {
     // The public key to verify whether a WebAPK is signed by WebAPK Minting
     // Server.
@@ skipping 66 matching lines @@
     public static void initForTesting(boolean enabled) {
         sEnabledForTesting = enabled;
     }
 
     public static boolean isEnabled() {
         if (sEnabledForTesting != null) return sEnabledForTesting;
 
         return isEnabledInPrefs();
     }
 
+    @CalledByNative
+    private static boolean areWebApkEnabled() {
+        return ChromeWebApkHost.isEnabled();
+    }
+
     /**
      * Check the cached value to figure out if the feature is enabled. We have
      * to use the cached value because native library may not yet been loaded.
      *
      * @return Whether the feature is enabled.
      */
     private static boolean isEnabledInPrefs() {
         // Will go away once the feature is enabled for everyone by default.
         StrictMode.ThreadPolicy oldPolicy = StrictMode.allowThreadDiskReads();
         try {
@@ skipping 15 matching lines @@
         boolean isEnabled = (!WEBAPK_RUNTIME_DISABLED.equals(experiment)
                 && instance.hasSwitch(ChromeSwitches.ENABLE_WEBAPK));
 
         if (isEnabled != wasEnabled) {
             Log.d(TAG, "WebApk setting changed (%s => %s)", wasEnabled, isEnabled);
             ChromePreferenceManager.getInstance(ContextUtils.getApplicationContext())
                     .setCachedWebApkRuntimeEnabled(isEnabled);
         }
     }
 }