Flag for Background Loading of Offline Pages.

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/OfflinePageBridge.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.offlinepages;
 
 import android.os.AsyncTask;
 
 import org.chromium.base.ObserverList;
 import org.chromium.base.ThreadUtils;
@@ skipping 182 matching lines @@
     /**
      * @return True if the offline pages feature is enabled, regardless whether bookmark or saved
      *     page shown in UI strings.
      */
     public static boolean isEnabled() {
         ThreadUtils.assertOnUiThread();
         return getFeatureMode() != FeatureMode.DISABLED;
     }
 
     /**
+     * @return True if the offline pages feature is enabled, regardless whether bookmark or saved
+     *     page shown in UI strings.
+     */
+    public static boolean isBackgroundLoadingEnabled() {
+        ThreadUtils.assertOnUiThread();
+        return nativeIsOfflinePagesBackgroundLoadingEnabled();
+    }
+
+    /**
      * @return True if an offline copy of the given URL can be saved.
      */
     public static boolean canSavePage(String url) {
         return nativeCanSavePage(url);
     }
 
     /**
      * Adds an observer to offline page model changes.
      * @param observer The observer to be added.
      */
@@ skipping 313 matching lines @@
 
     @CalledByNative
     private static OfflinePageItem createOfflinePageItem(String url, long offlineId,
             String clientNamespace, String clientId, String offlineUrl, long fileSize,
             long creationTime, int accessCount, long lastAccessTimeMs) {
         return new OfflinePageItem(url, offlineId, clientNamespace, clientId, offlineUrl, fileSize,
                 creationTime, accessCount, lastAccessTimeMs);
     }
 
     private static native int nativeGetFeatureMode();
+    private static native boolean nativeIsOfflinePagesBackgroundLoadingEnabled();

[Alexei Svitkine (slow), 2016/03/14 15:42:48]

Optional nit: Up to you, but instead of adding the wrapper, you can add your
feature to here:

https://code.google.com/p/chromium/codesearch#chromium/src/chrome/browser/and...

And then you can query it via ChromeFeatureList.java API. But your current set
up is OK too.

[Pete Williamson, 2016/03/14 17:36:51]

Done.

     private static native boolean nativeCanSavePage(String url);
     private static native OfflinePageBridge nativeGetOfflinePageBridgeForProfile(Profile profile);
 
     private native void nativeGetAllPages(
             long nativeOfflinePageBridge, List<OfflinePageItem> offlinePages);
     private native long[] nativeGetOfflineIdsForClientId(
             long nativeOfflinePageBridge, String clientNamespace, String clientId);
     private native OfflinePageItem nativeGetPageByOfflineId(
             long nativeOfflinePageBridge, long offlineId);
     private native OfflinePageItem nativeGetPageByOnlineURL(
             long nativeOfflinePageBridge, String onlineURL);
     private native OfflinePageItem nativeGetPageByOfflineUrl(
             long nativeOfflinePageBridge, String offlineUrl);
     private native void nativeSavePage(long nativeOfflinePageBridge, SavePageCallback callback,
             WebContents webContents, String clientNamespace, String clientId);
     private native void nativeMarkPageAccessed(long nativeOfflinePageBridge, long offlineId);
     private native void nativeDeletePage(
             long nativeOfflinePageBridge, DeletePageCallback callback, long offlineId);
     private native void nativeDeletePages(
             long nativeOfflinePageBridge, DeletePageCallback callback, long[] offlineIds);
     private native void nativeGetPagesToCleanUp(
             long nativeOfflinePageBridge, List<OfflinePageItem> offlinePages);
     private native void nativeCheckMetadataConsistency(long nativeOfflinePageBridge);
     private native String nativeGetOfflineUrlForOnlineUrl(
             long nativeOfflinePageBridge, String onlineUrl);
 }