Use mojo for cursor control in ozone drm

ui/ozone/platform/drm/mus_thread_proxy.h

 // Copyright 2016 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_DRM_MUS_THREAD_PROXY_H_
 #define UI_OZONE_PLATFORM_DRM_MUS_THREAD_PROXY_H_
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/observer_list.h"
 #include "base/synchronization/lock.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/ozone/platform/drm/gpu/inter_thread_messaging_proxy.h"
 #include "ui/ozone/platform/drm/host/drm_cursor.h"
 #include "ui/ozone/platform/drm/host/gpu_thread_adapter.h"
+#include "ui/ozone/public/interfaces/cursor.mojom.h"
 
 namespace base {
 class SingleThreadTaskRunner;
 }
 
 namespace ui {
 
 class DrmCursor;
 class DrmDisplayHostManager;
 class DrmOverlayManager;
 class DrmThread;
 class GpuThreadObserver;
+class MusThreadProxy;
+
+// Forwarding proxy to handle ownership semantics.
+class CursorProxyThread : public DrmCursorProxy {
+ public:
+  CursorProxyThread(MusThreadProxy* mus_thread_proxy);

[Tom Sepez, 2016/07/19 16:14:38]

nit: explicit

[rjkroege, 2016/07/21 01:10:42]

Done.

+  ~CursorProxyThread() override;
+
+ private:
+  // DrmCursorProxy.
+  void CursorSet(gfx::AcceleratedWidget window,
+                 const std::vector<SkBitmap>& bitmaps,
+                 const gfx::Point& point,
+                 int frame_delay_ms) override;
+  void Move(gfx::AcceleratedWidget window, const gfx::Point& point) override;
+  void InitializeOnEvdev() override;
+  MusThreadProxy* mus_thread_proxy_;  // Not owned.

[Tom Sepez, 2016/07/19 16:14:38]

nit: maybe blank line between methods and members. Also, can this be  
   MusThreadProxy* const mus_thread_proxy_;
?

[rjkroege, 2016/07/21 01:10:42]

Done.

+};
 
 // In Mus, the window server thread (analogous to Chrome's UI thread), GPU and
 // DRM threads coexist in a single Mus process. The |MusThreadProxy| connects
 // these threads together via cross-thread calls.
 class MusThreadProxy : public GpuThreadAdapter,
                        public InterThreadMessagingProxy,
                        public DrmCursorProxy {
  public:
   MusThreadProxy();
   ~MusThreadProxy() override;
@@ skipping 94 matching lines @@
   base::ThreadChecker on_window_server_thread_;
 
   base::WeakPtrFactory<MusThreadProxy> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MusThreadProxy);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_MUS_THREAD_PROXY_H_