Add unit tests for the Background Scheduler.

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

Index: chrome/android/java/src/org/chromium/chrome/browser/offlinepages/interfaces/BackgroundSchedulerProcessor.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/interfaces/BackgroundSchedulerProcessor.java b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/interfaces/BackgroundSchedulerProcessor.java
new file mode 100644
index 0000000000000000000000000000000000000000..499f464e366a24fba723e3e5a60dcb99b6252d0d
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/offlinepages/interfaces/BackgroundSchedulerProcessor.java
@@ -0,0 +1,21 @@
+// 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;
+
+/**
+ * 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 startProcessing(Callback<Boolean> callback);
+}