[Offline Pages on the NTP] Hide behind a base::Feature

chrome/android/java/src/org/chromium/chrome/browser/ntp/NewTabPage.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.ntp;
 
 import android.annotation.TargetApi;
 import android.app.Activity;
 import android.app.ActivityManager;
 import android.app.Dialog;
 import android.content.Context;
 import android.content.Intent;
 import android.graphics.Canvas;
 import android.graphics.Color;
 import android.graphics.Rect;
 import android.os.Build;
 import android.view.ContextMenu;
 import android.view.LayoutInflater;
 import android.view.Menu;
 import android.view.MenuItem.OnMenuItemClickListener;
 import android.view.View;
 
 import org.chromium.base.ApiCompatibilityUtils;
 import org.chromium.base.CommandLine;
 import org.chromium.base.VisibleForTesting;
 import org.chromium.base.metrics.RecordHistogram;
 import org.chromium.base.metrics.RecordUserAction;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeApplication;
+import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.NativePage;
 import org.chromium.chrome.browser.UrlConstants;
 import org.chromium.chrome.browser.compositor.layouts.content.InvalidationAwareThumbnailProvider;
 import org.chromium.chrome.browser.document.DocumentMetricIds;
 import org.chromium.chrome.browser.document.DocumentUtils;
 import org.chromium.chrome.browser.enhancedbookmarks.EnhancedBookmarkUtils;
 import org.chromium.chrome.browser.favicon.FaviconHelper;
 import org.chromium.chrome.browser.favicon.FaviconHelper.FaviconImageCallback;
 import org.chromium.chrome.browser.favicon.FaviconHelper.IconAvailabilityCallback;
@@ skipping 163 matching lines @@
         manager.setDialog(dialog);
         dialog.show();
     }
 
     @VisibleForTesting
     static void setMostVisitedSitesForTests(MostVisitedSites mostVisitedSitesForTests) {
         sMostVisitedSitesForTests = mostVisitedSitesForTests;
     }
 
     private final NewTabPageManager mNewTabPageManager = new NewTabPageManager() {
+        private static final String NTP_OFFLINE_PAGES_FEATURE_NAME = "NTPOfflinePages";
+
+        private boolean isNtpOfflinePagesEnabled() {
+            return OfflinePageBridge.isEnabled()
+                    && ChromeFeatureList.isEnabled(NTP_OFFLINE_PAGES_FEATURE_NAME);
+        }
+
         @Override
         public boolean isLocationBarShownInNTP() {
             if (mIsDestroyed) return false;
             Context context = mNewTabPageView.getContext();
             return isInSingleUrlBarMode(context)
                     && !mNewTabPageView.urlFocusAnimationsDisabled();
         }
 
         @Override
         public boolean isVoiceSearchEnabled() {
@@ skipping 214 matching lines @@
         public void ensureIconIsAvailable(String pageUrl, String iconUrl, boolean isLargeIcon,
                 IconAvailabilityCallback callback) {
             if (mIsDestroyed) return;
             if (mFaviconHelper == null) mFaviconHelper = new FaviconHelper();
             mFaviconHelper.ensureIconIsAvailable(
                     mProfile, mTab.getWebContents(), pageUrl, iconUrl, isLargeIcon, callback);
         }
 
         @Override
         public boolean isOfflineAvailable(String pageUrl) {
-            if (mIsDestroyed || !OfflinePageBridge.isEnabled()) return false;
+            if (mIsDestroyed || !isNtpOfflinePagesEnabled()) return false;
             if (mOfflinePageBridge == null) mOfflinePageBridge = new OfflinePageBridge(mProfile);
             return mOfflinePageBridge.getPageByOnlineURL(pageUrl) != null;
         }
 
         @Override
         public void onLogoClicked(boolean isAnimatedLogoShowing) {
             if (mIsDestroyed) return;
 
             if (!isAnimatedLogoShowing && mAnimatedLogoUrl != null) {
                 mNewTabPageView.showLogoLoadingView();
@@ skipping 295 matching lines @@
     @Override
     public boolean shouldCaptureThumbnail() {
         return mNewTabPageView.shouldCaptureThumbnail();
     }
 
     @Override
     public void captureThumbnail(Canvas canvas) {
         mNewTabPageView.captureThumbnail(canvas);
     }
 }