Get mouse events to work with win aura, and make the combobox function in the views examples app.

ui/views/widget/desktop_root_window_host_win.h

Index: ui/views/widget/desktop_root_window_host_win.h
===================================================================
--- ui/views/widget/desktop_root_window_host_win.h	(revision 156204)
+++ ui/views/widget/desktop_root_window_host_win.h	(working copy)
@@ -9,7 +9,14 @@
 #include "ui/views/widget/desktop_root_window_host.h"
 #include "ui/views/win/hwnd_message_handler_delegate.h"
 
+namespace aura {
+class DesktopActivationClient;
+class DesktopDispatcherClient;
+class FocusManager;
+}
+
 namespace views {
+class DesktopCaptureClient;
 class HWNDMessageHandler;
 
 class DesktopRootWindowHostWin : public DesktopRootWindowHost,
@@ -25,7 +32,12 @@
   // Overridden from DesktopRootWindowHost:
   virtual void Init(aura::Window* content_window,
                     const Widget::InitParams& params) OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual void CloseNow() OVERRIDE;
+  virtual aura::RootWindowHost* AsRootWindowHost() OVERRIDE;
   virtual void ShowWindowWithState(ui::WindowShowState show_state) OVERRIDE;
+  virtual bool IsVisible() const OVERRIDE;
+  virtual gfx::Rect GetClientAreaBoundsInScreen() const OVERRIDE;
 
   // Overridden from aura::RootWindowHost:
   virtual aura::RootWindow* GetRootWindow() OVERRIDE;
@@ -128,6 +140,10 @@
 
   scoped_ptr<aura::RootWindow> root_window_;
   scoped_ptr<HWNDMessageHandler> message_handler_;
+  scoped_ptr<DesktopCaptureClient> capture_client_;
+  scoped_ptr<aura::DesktopActivationClient> activation_client_;
+  scoped_ptr<aura::DesktopDispatcherClient> dispatcher_client_;
+  scoped_ptr<aura::FocusManager> focus_manager_;
 
   // TODO(beng): Consider providing an interface to DesktopNativeWidgetAura
   //             instead of providing this route back to Widget.