[Android] Native initialization task for BackgroundTaskScheduler

content/public/android/java/src/org/chromium/content/browser/BrowserStartupController.java

 // Copyright 2013 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.content.browser;
 
 import android.os.Handler;
 import android.os.StrictMode;
 
 import org.chromium.base.ContextUtils;
@@ skipping 119 matching lines @@
         if (sInstance == null) {
             assert LibraryProcessType.PROCESS_BROWSER == libraryProcessType
                     || LibraryProcessType.PROCESS_WEBVIEW == libraryProcessType;
             sInstance = new BrowserStartupController(libraryProcessType);
         }
         assert sInstance.mLibraryProcessType == libraryProcessType : "Wrong process type";
         return sInstance;
     }
 
     @VisibleForTesting
-    static BrowserStartupController overrideInstanceForTest(BrowserStartupController controller) {
-        if (sInstance == null) {
-            sInstance = controller;
-        }
+    public static BrowserStartupController overrideInstanceForTest(
+            BrowserStartupController controller) {
+        sInstance = controller;
         return sInstance;
     }
 
     /**
      * Start the browser process asynchronously. This will set up a queue of UI thread tasks to
      * initialize the browser process.
      * <p/>
      * Note that this can only be called on the UI thread.
      *
      * @param startGpuProcess Whether to start the GPU process if it is not started.
@@ skipping 196 matching lines @@
 
     private static native void nativeSetCommandLineFlags(
             boolean singleProcess, String pluginDescriptor);
 
     // Is this an official build of Chrome? Only native code knows for sure. Official build
     // knowledge is needed very early in process startup.
     private static native boolean nativeIsOfficialBuild();
 
     private static native boolean nativeIsPluginEnabled();
 }