Custom Tabs: disable all speculation if third party cookies are blocked.

chrome/android/java/src/org/chromium/chrome/browser/customtabs/CustomTabsConnection.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.customtabs;
 
 import android.app.ActivityManager;
 import android.app.Application;
 import android.app.PendingIntent;
 import android.content.Context;
@@ skipping 934 matching lines @@
     @VisibleForTesting
     void cleanUpSession(final CustomTabsSessionToken session) {
         ThreadUtils.runOnUiThread(new Runnable() {
             @Override
             public void run() {
                 mClientManager.cleanupSession(session);
             }
         });
     }
 
-    private boolean maySpeculate(CustomTabsSessionToken session) {
+    @VisibleForTesting
+    boolean maySpeculate(CustomTabsSessionToken session) {
         if (!DeviceClassManager.enablePrerendering()) return false;
+        PrefServiceBridge prefs = PrefServiceBridge.getInstance();
+        if (prefs.isBlockThirdPartyCookiesEnabled()) return false;
         // TODO(yusufo): The check for prerender in PrivacyManager now checks for the network
         // connection type as well, we should either change that or add another check for custom
         // tabs. Then PrivacyManager should be used to make the below check.
-        if (!PrefServiceBridge.getInstance().getNetworkPredictionEnabled()) return false;
+        if (!prefs.getNetworkPredictionEnabled()) return false;
         if (DataReductionProxySettings.getInstance().isDataReductionProxyEnabled()) return false;
         ConnectivityManager cm =
                 (ConnectivityManager) mApplication.getApplicationContext().getSystemService(
                         Context.CONNECTIVITY_SERVICE);
         return !cm.isActiveNetworkMetered() || shouldPrerenderOnCellularForSession(session);
     }
 
     /** Cancels the speculation for a given session, or any session if null. */
     void cancelSpeculation(CustomTabsSessionToken session) {
         ThreadUtils.assertOnUiThread();
@@ skipping 165 matching lines @@
      */
     String getReferrer(CustomTabsSessionToken session, Intent intent) {
         String referrer = IntentHandler.getReferrerUrlIncludingExtraHeaders(intent);
         if (referrer == null && getReferrerForSession(session) != null) {
             referrer = getReferrerForSession(session).getUrl();
         }
         if (referrer == null) referrer = "";
         return referrer;
     }
 }