Adds the UserInputMonitor implementation for Windows.

media/base/user_input_monitor_mac.cc

Index: media/base/user_input_monitor_mac.cc
diff --git a/media/base/user_input_monitor_mac.cc b/media/base/user_input_monitor_mac.cc
index 3d19134f321ded835bb3ce070139bda1b4dc5019..f70ee4d06a45d519fd97e42a365b45e08eedeacf 100644
--- a/media/base/user_input_monitor_mac.cc
+++ b/media/base/user_input_monitor_mac.cc
@@ -17,10 +17,10 @@ class UserInputMonitorMac : public UserInputMonitor {
   virtual size_t GetKeyPressCount() const OVERRIDE;
 
  private:
-  virtual void StartMouseMonitoring() OVERRIDE;
-  virtual void StopMouseMonitoring() OVERRIDE;
   virtual void StartKeyboardMonitoring() OVERRIDE;
   virtual void StopKeyboardMonitoring() OVERRIDE;
+  virtual void StartMouseMonitoring() OVERRIDE;
+  virtual void StopMouseMonitoring() OVERRIDE;
 
   DISALLOW_COPY_AND_ASSIGN(UserInputMonitorMac);
 };
@@ -36,16 +36,16 @@ size_t UserInputMonitorMac::GetKeyPressCount() const {
                                           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(