Adds the UserInputMonitor implementation for Windows.

media/base/user_input_monitor_mac.cc

 // Copyright 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"
 
 #include <ApplicationServices/ApplicationServices.h>
 
 namespace media {
 namespace {
 
 class UserInputMonitorMac : public UserInputMonitor {
  public:
   UserInputMonitorMac();
   virtual ~UserInputMonitorMac();
 
   virtual size_t GetKeyPressCount() const OVERRIDE;
 
  private:
+  virtual void StartKeyboardMonitoring() OVERRIDE;
+  virtual void StopKeyboardMonitoring() OVERRIDE;
   virtual void StartMouseMonitoring() OVERRIDE;
   virtual void StopMouseMonitoring() OVERRIDE;
-  virtual void StartKeyboardMonitoring() OVERRIDE;
-  virtual void StopKeyboardMonitoring() OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(UserInputMonitorMac);
 };
 
 UserInputMonitorMac::UserInputMonitorMac() {}
 
 UserInputMonitorMac::~UserInputMonitorMac() {}
 
 size_t UserInputMonitorMac::GetKeyPressCount() const {
   // Use |kCGEventSourceStateHIDSystemState| since we only want to count
   // hardware generated events.
   return CGEventSourceCounterForEventType(kCGEventSourceStateHIDSystemState,
                                           kCGEventKeyDown);
 }
 
+void UserInputMonitorMac::StartKeyboardMonitoring() {}
+
+void UserInputMonitorMac::StopKeyboardMonitoring() {}
+
 // TODO(jiayl): add the impl.
 void UserInputMonitorMac::StartMouseMonitoring() { NOTIMPLEMENTED(); }
 
 // TODO(jiayl): add the impl.
 void UserInputMonitorMac::StopMouseMonitoring() { NOTIMPLEMENTED(); }
 
-void UserInputMonitorMac::StartKeyboardMonitoring() {}
-
-void UserInputMonitorMac::StopKeyboardMonitoring() {}
-
 }  // namespace
 
 scoped_ptr<UserInputMonitor> UserInputMonitor::Create(
     const scoped_refptr<base::SingleThreadTaskRunner>& input_task_runner,
     const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner) {
   return scoped_ptr<UserInputMonitor>(new UserInputMonitorMac());
 }
 
 }  // namespace media