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

ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc

Index: ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
diff --git a/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc b/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
index cb73a964446b288fefd75df9b3dc054984856a58..ed8bc8dde915282cb71b70af1f459bcdb0abaab8 100644
--- a/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
+++ b/ui/ozone/platform/dri/chromeos/native_display_delegate_dri.cc
@@ -4,6 +4,9 @@
 
 #include "ui/ozone/platform/dri/chromeos/native_display_delegate_dri.h"
 
+#include "base/bind.h"
+#include "ui/display/types/chromeos/native_display_observer.h"
+#include "ui/ozone/platform/dri/chromeos/display_event_listener.h"
 #include "ui/ozone/platform/dri/chromeos/display_mode_dri.h"
 #include "ui/ozone/platform/dri/chromeos/display_snapshot_dri.h"
 #include "ui/ozone/platform/dri/dri_surface_factory.h"
@@ -17,8 +20,10 @@ const size_t kMaxDisplayCount = 2;
 }  // namespace
 
 NativeDisplayDelegateDri::NativeDisplayDelegateDri(
-    DriSurfaceFactory* surface_factory)
-    : surface_factory_(surface_factory) {}
+    DriSurfaceFactory* surface_factory,
+    scoped_ptr<DisplayEventListener> display_listener)
+    : surface_factory_(surface_factory),
+      display_event_listener_(display_listener.Pass()) {}
 
 NativeDisplayDelegateDri::~NativeDisplayDelegateDri() {}
 
@@ -28,6 +33,11 @@ void NativeDisplayDelegateDri::Initialize() {
 
   CHECK_EQ(gfx::SurfaceFactoryOzone::INITIALIZED, state)
       << "Failed to initialize hardware";
+
+  if (display_event_listener_)
+    display_event_listener_->StartMonitoring(
+        base::Bind(&NativeDisplayDelegateDri::OnDisplayEvent,
+                   base::Unretained(this)));
 }
 
 void NativeDisplayDelegateDri::GrabServer() {}
@@ -154,4 +164,8 @@ void NativeDisplayDelegateDri::RemoveObserver(NativeDisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
+void NativeDisplayDelegateDri::OnDisplayEvent() {
+  NOTIMPLEMENTED();
+}
+
 }  // namespace ui