Refactor ozone drm cursor code for mojo

ui/events/ozone/evdev/cursor_delegate_evdev.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_EVENTS_OZONE_EVDEV_CURSOR_DELEGATE_EVDEV_H_
 #define UI_EVENTS_OZONE_EVDEV_CURSOR_DELEGATE_EVDEV_H_
 
 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace gfx {
 class Vector2dF;
 class Rect;
 }
 
 namespace ui {
 
 class EVENTS_OZONE_EVDEV_EXPORT CursorDelegateEvdev {
  public:
   virtual ~CursorDelegateEvdev() {}
 
-  // Move the cursor.
+  // Move the cursor from the Evdev thread.
   virtual void MoveCursor(const gfx::Vector2dF& delta) = 0;
+  // Move the cursor from the UI thread only.
   virtual void MoveCursorTo(gfx::AcceleratedWidget widget,
                             const gfx::PointF& location) = 0;
+  // Move the cursor from the UI thread only.
   virtual void MoveCursorTo(const gfx::PointF& location) = 0;
 
-  // Location in screen.
+  // Location in screen. Either thread, IPC-free.
   virtual gfx::PointF GetLocation() = 0;
 
-  // Cursor visibility.
+  // Cursor visibility. Either thread, IPC-free.
   virtual bool IsCursorVisible() = 0;
 
-  // The bounds that the cursor is confined to.
+  // The bounds that the cursor is confined to. Either thread, IPC-free.
   virtual gfx::Rect GetCursorConfinedBounds() = 0;
+
+  // Any necessary initialization from Evdev thread.
+  virtual void InitializeOnEvdev() = 0;
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_OZONE_EVDEV_CURSOR_DELEGATE_EVDEV_H_