Add CreateWindowCapturer() and CreateScreenCapturer() in DesktopCapturer

webrtc/modules/desktop_capture/mock_desktop_capturer_callback.h

Index: webrtc/modules/desktop_capture/mock_desktop_capturer_callback.h
diff --git a/webrtc/modules/desktop_capture/mock_desktop_capturer_callback.h b/webrtc/modules/desktop_capture/mock_desktop_capturer_callback.h
new file mode 100644
index 0000000000000000000000000000000000000000..3f67a9ef85d19138fa1ac827bdc14a4472825efc
--- /dev/null
+++ b/webrtc/modules/desktop_capture/mock_desktop_capturer_callback.h
@@ -0,0 +1,20 @@
+/* Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_MOCK_DESKTOP_CAPTURER_CALLBACK_H_
+#define WEBRTC_MODULES_DESKTOP_CAPTURE_MOCK_DESKTOP_CAPTURER_CALLBACK_H_
+
+#include "webrtc/modules/desktop_capture/screen_capturer_mock_objects.h"
+
+namespace webrtc {
+// TODO(zijiehe): Remove MockScreenCapturerCallback.
+class MockDesktopCapturerCallback : public MockScreenCapturerCallback {};
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_DESKTOP_CAPTURE_MOCK_DESKTOP_CAPTURER_CALLBACK_H_