Finch kill switch feature for background tab.

chrome/android/javatests/src/org/chromium/chrome/browser/customtabs/CustomTabActivityTest.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 static org.chromium.base.test.util.Restriction.RESTRICTION_TYPE_NON_LOW_END_DEVICE;
 
 import android.app.Activity;
 import android.app.Application;
@@ skipping 39 matching lines @@
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.library_loader.LibraryLoader;
 import org.chromium.base.library_loader.LibraryProcessType;
 import org.chromium.base.test.util.CallbackHelper;
 import org.chromium.base.test.util.CommandLineFlags;
 import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.base.test.util.RetryOnFailure;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeActivity;
+import org.chromium.chrome.browser.ChromeFeatureList;
 import org.chromium.chrome.browser.ChromeSwitches;
 import org.chromium.chrome.browser.ChromeTabbedActivity;
 import org.chromium.chrome.browser.IntentHandler;
 import org.chromium.chrome.browser.TabsOpenedFromExternalAppTest;
 import org.chromium.chrome.browser.WarmupManager;
 import org.chromium.chrome.browser.appmenu.AppMenuHandler;
 import org.chromium.chrome.browser.document.ChromeLauncherActivity;
 import org.chromium.chrome.browser.firstrun.FirstRunStatus;
 import org.chromium.chrome.browser.metrics.PageLoadMetrics;
 import org.chromium.chrome.browser.prerender.ExternalPrerenderHandler;
@@ skipping 16 matching lines @@
 import org.chromium.content.browser.test.util.CriteriaHelper;
 import org.chromium.content.browser.test.util.DOMUtils;
 import org.chromium.content.browser.test.util.JavaScriptUtils;
 import org.chromium.content_public.browser.LoadUrlParams;
 import org.chromium.content_public.browser.WebContentsObserver;
 import org.chromium.net.test.EmbeddedTestServer;
 import org.chromium.net.test.util.TestWebServer;
 import org.chromium.ui.mojom.WindowOpenDisposition;
 
 import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.concurrent.Callable;
 import java.util.concurrent.TimeoutException;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.concurrent.atomic.AtomicReference;
 
 /**
  * Instrumentation tests for app menu, context menu, and toolbar of a {@link CustomTabActivity}.
  */
 public class CustomTabActivityTest extends CustomTabActivityTestBase {
     private static final int MAX_MENU_CUSTOM_ITEMS = 5;
@@ skipping 1697 matching lines @@
      * Test whether the url shown on hidden tab gets updated from about:blank when it
      * completes in the background.
      */
     @SmallTest
     @Restriction(RESTRICTION_TYPE_NON_LOW_END_DEVICE)
     @RetryOnFailure
     public void testHiddenTabCorrectUrl() throws Exception {
         testSpeculateCorrectUrl(CustomTabsConnection.SpeculationParams.HIDDEN_TAB);
     }
 
+    /**
+     * Test that a hidden tab speculation is executed as a prerender if the |CCT_BACKGROUND_TAB|
+     * feature is disabled.
+     **/
+    @SmallTest
+    @Restriction(RESTRICTION_TYPE_NON_LOW_END_DEVICE)
+    @RetryOnFailure
+    public void testHiddenTabDisabled() throws Exception {
+        // One should be able to use @Features instead of calling
+        // ChromeFeatureList.setTestFeatures, but it doesn't appear to be effective.
+        // (perhaps a restriction due to running on Android?)
+        Map<String, Boolean> features = new HashMap<>();
+        features.put(ChromeFeatureList.CCT_BACKGROUND_TAB, false);
+        ChromeFeatureList.setTestFeatures(features);

[Benoit L, 2017/04/24 16:18:00]

Should this be reset in a finally block?

Seems that the annotation sets the list to null.

+        testSpeculateCorrectUrl(CustomTabsConnection.SpeculationParams.HIDDEN_TAB,
+                CustomTabsConnection.SpeculationParams.PRERENDER);
+    }
+
     private void testSpeculateCorrectUrl(int speculationMode) throws Exception {
+        testSpeculateCorrectUrl(speculationMode, speculationMode);
+    }
+
+    private void testSpeculateCorrectUrl(int requestedSpeculationMode, int usedSpeculationMode)
+            throws Exception {
         Context context = getInstrumentation().getTargetContext().getApplicationContext();
         final CustomTabsConnection connection = warmUpAndWait();
         CustomTabsSessionToken token = CustomTabsSessionToken.createDummySessionTokenForTesting();
         connection.newSession(token);
-        connection.setSpeculationModeForSession(token, speculationMode);
+        connection.setSpeculationModeForSession(token, requestedSpeculationMode);
         assertTrue(connection.mayLaunchUrl(token, Uri.parse(mTestPage), null, null));
-        ensureCompletedSpeculationForUrl(connection, mTestPage, speculationMode);
+        ensureCompletedSpeculationForUrl(connection, mTestPage, usedSpeculationMode);
 
         try {
             startCustomTabActivityWithIntent(CustomTabsTestUtils.createMinimalCustomTabIntent(
                     context, mTestPage));
         } catch (InterruptedException e) {
             fail();
         }
         assertEquals(Uri.parse(mTestPage).getHost() + ":" + Uri.parse(mTestPage).getPort(),
                 ((EditText) mActivity.findViewById(R.id.url_bar)).getText()
                         .toString());
@@ skipping 665 matching lines @@
         switch (speculationMode) {
             case CustomTabsConnection.SpeculationParams.PRERENDER:
                 return "prerender";
             case CustomTabsConnection.SpeculationParams.HIDDEN_TAB:
                 return "hidden";
             default:
                 return "visible";
         }
     }
 }