[Offline pages] Updates to background scheduling to use BTS

chrome/android/java/src/org/chromium/chrome/browser/offlinepages/interfaces/BackgroundSchedulerProcessor.java

-// Copyright 2016 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.interfaces;
-
-import org.chromium.base.Callback;
-import org.chromium.chrome.browser.offlinepages.DeviceConditions;
-
-/**
- * Interface to allow mocking out the BackgroundSchedulerProcessor, which must call static
- * methods in BackgroundSchedulerBridge.
- */
-public interface BackgroundSchedulerProcessor {
-    /**
-     * Starts processing of one or more queued background requests.  Returns whether processing was
-     * started and that caller should expect a callback (once processing has completed or
-     * terminated).  If processing was already active or not able to process for some other reason,
-     * returns false and this calling instance will not receive a callback.
-     */
-    boolean startScheduledProcessing(DeviceConditions deviceConditions, Callback<Boolean> callback);
-
-    /**
-     * Stops processing background requests.
-     * @return Whether processing should be scheduled again at a later time, because there is more
-     * work.
-     */
-    boolean stopScheduledProcessing();
-}