Refactor Udev device support in Ozone and add a DRM hotplug monitor

ui/ozone/platform/dri/chromeos/native_display_delegate_dri.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_OZONE_PLATFORM_DRI_CHROMEOS_NATIVE_DISPLAY_DELEGATE_DRI_H_
 #define UI_OZONE_PLATFORM_DRI_CHROMEOS_NATIVE_DISPLAY_DELEGATE_DRI_H_
 
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/scoped_vector.h"
 #include "base/observer_list.h"
 #include "ui/display/types/chromeos/native_display_delegate.h"
 
 namespace ui {
 
+class DisplayEventListener;
 class DisplaySnapshotDri;
 class DriSurfaceFactory;
 
 class NativeDisplayDelegateDri : public NativeDisplayDelegate {
  public:
-  NativeDisplayDelegateDri(DriSurfaceFactory* surface_factory);
+  NativeDisplayDelegateDri(DriSurfaceFactory* surface_factory,
+                           scoped_ptr<DisplayEventListener> display_listener_);
   virtual ~NativeDisplayDelegateDri();
 
   // NativeDisplayDelegate overrides:
   virtual void Initialize() OVERRIDE;
   virtual void GrabServer() OVERRIDE;
   virtual void UngrabServer() OVERRIDE;
   virtual void SyncWithServer() OVERRIDE;
   virtual void SetBackgroundColor(uint32_t color_argb) OVERRIDE;
   virtual void ForceDPMSOn() OVERRIDE;
   virtual std::vector<DisplaySnapshot*> GetDisplays() OVERRIDE;
@@ skipping 10 matching lines @@
   virtual std::vector<ui::ColorCalibrationProfile>
       GetAvailableColorCalibrationProfiles(
           const ui::DisplaySnapshot& output) OVERRIDE;
   virtual bool SetColorCalibrationProfile(
       const ui::DisplaySnapshot& output,
       ui::ColorCalibrationProfile new_profile) OVERRIDE;
   virtual void AddObserver(NativeDisplayObserver* observer) OVERRIDE;
   virtual void RemoveObserver(NativeDisplayObserver* observer) OVERRIDE;
 
  private:
+  // Callback for display events.
+  void OnDisplayEvent();
+
   DriSurfaceFactory* surface_factory_;  // Not owned.
+  scoped_ptr<DisplayEventListener> display_event_listener_;
   ScopedVector<const DisplayMode> cached_modes_;
   ScopedVector<DisplaySnapshotDri> cached_displays_;
   ObserverList<NativeDisplayObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeDisplayDelegateDri);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRI_CHROMEOS_NATIVE_DISPLAY_DELEGATE_DRI_H_