Add unit tests for the Background Scheduler.

chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/StubBackgroundSchedulerProcessor.java

Index: chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/StubBackgroundSchedulerProcessor.java
diff --git a/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/StubBackgroundSchedulerProcessor.java b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/StubBackgroundSchedulerProcessor.java
new file mode 100644
index 0000000000000000000000000000000000000000..accc8aaef6f15194a17db9fa4744e80412db1d04
--- /dev/null
+++ b/chrome/android/junit/src/org/chromium/chrome/browser/offlinepages/StubBackgroundSchedulerProcessor.java
@@ -0,0 +1,25 @@
+// 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;
+
+import org.chromium.base.Callback;
+import org.chromium.chrome.browser.offlinepages.interfaces.BackgroundSchedulerProcessor;
+
+/**
+ * Custom stub for our own BackgroundSchedulerRequestProcessor.
+ */
+public class StubBackgroundSchedulerProcessor implements BackgroundSchedulerProcessor {
+    private boolean mStartProcessingCalled = false;
+
+    public boolean getStartProcessingCalled() {
+        return mStartProcessingCalled;
+    }
+
+    @Override
+    public boolean startProcessing(Callback<Boolean> callback) {
+        mStartProcessingCalled = true;
+        return true;
+    }
+}