Adding VideoCaptureDevice for Mac.

media/video/capture/video_capture_device_unittest_helper.h

Index: media/video/capture/video_capture_device_unittest_helper.h
diff --git a/media/video/capture/video_capture_device_unittest_helper.h b/media/video/capture/video_capture_device_unittest_helper.h
new file mode 100644
index 0000000000000000000000000000000000000000..c11116ff27823eb640b8e881d41dfe4e947087b1
--- /dev/null
+++ b/media/video/capture/video_capture_device_unittest_helper.h
@@ -0,0 +1,17 @@
+// Copyright (c) 2011 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.
+
+// Helper function to trigger runloop execution. Only needed for Mac OS X.
+
+#include "build/build_config.h"
+
+namespace media {
+
+#if defined(OS_MACOSX)
+void ExecuteRunLoop();
+#else
+void ExecuteRunLoop() {};
+#endif
+
+}  // namespace media