x11: Move X event handling out of the message-pump.

ui/display/chromeos/x11/native_display_event_dispatcher_x11.h

 // Copyright 2014 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.
 
 #ifndef UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_EVENT_DISPATCHER_X11_H_
 #define UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_EVENT_DISPATCHER_X11_H_
 
-#include "base/message_loop/message_pump_dispatcher.h"
 #include "base/time/tick_clock.h"
 #include "base/time/time.h"
 #include "ui/display/chromeos/x11/native_display_delegate_x11.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
 
 namespace ui {
 
+// The implementation is interested in the cases of RRNotify events which
+// correspond to output add/remove events. Note that Output add/remove events
+// are sent in response to our own reconfiguration operations so spurious events
+// are common. Spurious events will have no effect.
 class DISPLAY_EXPORT NativeDisplayEventDispatcherX11
-    : public base::MessagePumpDispatcher {
+    : public ui::PlatformEventDispatcher {
  public:
   NativeDisplayEventDispatcherX11(
       NativeDisplayDelegateX11::HelperDelegate* delegate,
       int xrandr_event_base);
   virtual ~NativeDisplayEventDispatcherX11();
 
-  // base::MessagePumpDispatcher overrides:
-  //
-  // Called when an RRNotify event is received.  The implementation is
-  // interested in the cases of RRNotify events which correspond to output
-  // add/remove events.  Note that Output add/remove events are sent in response
-  // to our own reconfiguration operations so spurious events are common.
-  // Spurious events will have no effect.
-  virtual uint32_t Dispatch(const base::NativeEvent& event) OVERRIDE;
+  // ui::PlatformEventDispatcher:
+  virtual bool CanDispatchEvent(const PlatformEvent& event) OVERRIDE;
+  virtual uint32_t DispatchEvent(const PlatformEvent& event) OVERRIDE;
 
   void SetTickClockForTest(scoped_ptr<base::TickClock> tick_clock);
 
   // How long the cached output is valid.
   static const int kCachedOutputsExpirationMs;
 
  private:
   NativeDisplayDelegateX11::HelperDelegate* delegate_;  // Not owned.
 
   // The base of the event numbers used to represent XRandr events used in
   // decoding events regarding output add/remove.
   int xrandr_event_base_;
 
   // The last time display observers were notified.
   base::TimeTicks last_notified_time_;
 
   scoped_ptr<base::TickClock> tick_clock_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeDisplayEventDispatcherX11);
 };
 
 }  // namespace ui
 
 #endif  // UI_DISPLAY_CHROMEOS_X11_NATIVE_DISPLAY_EVENT_DISPATCHER_X11_H_