Adding key press detection in the browser process.

media/base/user_input_monitor_mac.mm

Index: media/base/user_input_monitor_mac.mm
diff --git a/media/base/user_input_monitor_mac.mm b/media/base/user_input_monitor_mac.mm
new file mode 100644
index 0000000000000000000000000000000000000000..d6a66ab51e54168637f3dcf189f606b8314951a0
--- /dev/null
+++ b/media/base/user_input_monitor_mac.mm
@@ -0,0 +1,18 @@
+// Copyright (c) 2013 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.
+
+#include "media/base/user_input_monitor.h"
+
+namespace media {
+
+scoped_ptr<UserInputMonitor> UserInputMonitor::Create(
+    scoped_refptr<base::SingleThreadTaskRunner> input_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
+    scoped_refptr<base::SingleThreadTaskRunner> observer_task_runner,
+    uint8 events_of_interest,
+    base::WeakPtr<UserInputObserver> observer) {
+  return scoped_ptr<UserInputMonitor>(NULL);
+}
+
+}  // namespace media