Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/drm_gpu_platform_support.h

Index: ui/ozone/platform/drm/gpu/drm_gpu_platform_support.h
diff --git a/ui/ozone/platform/drm/gpu/drm_gpu_platform_support.h b/ui/ozone/platform/drm/gpu/drm_gpu_platform_support.h
index 21caf35e6550877b29c2cadb9133d99aad7ba639..812865cba26edb05f8100aea908457dc2e41bde2 100644
--- a/ui/ozone/platform/drm/gpu/drm_gpu_platform_support.h
+++ b/ui/ozone/platform/drm/gpu/drm_gpu_platform_support.h
@@ -5,46 +5,18 @@
 #ifndef UI_OZONE_PLATFORM_DRM_GPU_DRM_GPU_PLATFORM_SUPPORT_H_
 #define UI_OZONE_PLATFORM_DRM_GPU_DRM_GPU_PLATFORM_SUPPORT_H_
 
-#include "base/containers/scoped_ptr_hash_map.h"
-#include "base/memory/scoped_ptr.h"
-#include "ipc/message_filter.h"
-#include "ui/display/types/display_constants.h"
-#include "ui/gfx/native_widget_types.h"
+#include "base/memory/ref_counted.h"
 #include "ui/ozone/public/gpu_platform_support.h"
 
-class SkBitmap;
-
-namespace base {
-class FilePath;
-class SingleThreadTaskRunner;
-struct FileDescriptor;
-}
-
-namespace gfx {
-class Point;
-class Rect;
-}
-
 namespace ui {
 
-class DrmDeviceManager;
-class DrmGpuDisplayManager;
-class DrmSurfaceFactory;
-class DrmWindow;
-class ScreenManager;
-class ScanoutBufferGenerator;
-
-struct DisplayMode_Params;
-struct DisplaySnapshot_Params;
-struct OverlayCheck_Params;
-struct GammaRampRGBEntry;
+class DrmThread;
+class DrmThreadMessageProxy;
 
 class DrmGpuPlatformSupport : public GpuPlatformSupport {
  public:
-  DrmGpuPlatformSupport(DrmDeviceManager* drm_device_manager,
-                        ScreenManager* screen_manager,
-                        ScanoutBufferGenerator* buffer_generator,
-                        scoped_ptr<DrmGpuDisplayManager> display_manager);
+  explicit DrmGpuPlatformSupport(
+      const scoped_refptr<DrmThreadMessageProxy>& filter);
   ~DrmGpuPlatformSupport() override;
 
   // GpuPlatformSupport:
@@ -55,44 +27,9 @@ class DrmGpuPlatformSupport : public GpuPlatformSupport {
   bool OnMessageReceived(const IPC::Message& message) override;
 
  private:
-  void OnCreateWindow(gfx::AcceleratedWidget widget);
-  void OnDestroyWindow(gfx::AcceleratedWidget widget);
-  void OnWindowBoundsChanged(gfx::AcceleratedWidget widget,
-                             const gfx::Rect& bounds);
-  void OnCursorSet(gfx::AcceleratedWidget widget,
-                   const std::vector<SkBitmap>& bitmaps,
-                   const gfx::Point& location,
-                   int frame_delay_ms);
-  void OnCursorMove(gfx::AcceleratedWidget widget, const gfx::Point& location);
-  void OnCheckOverlayCapabilities(
-      gfx::AcceleratedWidget widget,
-      const std::vector<OverlayCheck_Params>& overlays);
-
-  // Display related IPC handlers.
-  void OnRefreshNativeDisplays();
-  void OnConfigureNativeDisplay(int64_t id,
-                                const DisplayMode_Params& mode,
-                                const gfx::Point& origin);
-  void OnDisableNativeDisplay(int64_t id);
-  void OnTakeDisplayControl();
-  void OnRelinquishDisplayControl();
-  void OnAddGraphicsDevice(const base::FilePath& path,
-                           const base::FileDescriptor& fd);
-  void OnRemoveGraphicsDevice(const base::FilePath& path);
-  void OnGetHDCPState(int64_t display_id);
-  void OnSetHDCPState(int64_t display_id, HDCPState state);
-  void OnSetGammaRamp(int64_t id, const std::vector<GammaRampRGBEntry>& lut);
-
-  void SetIOTaskRunner(
-      const scoped_refptr<base::SingleThreadTaskRunner>& io_task_runner);
-
-  IPC::Sender* sender_ = nullptr;             // Not owned.
-  DrmDeviceManager* drm_device_manager_;  // Not owned.
-  ScreenManager* screen_manager_;         // Not owned.
-  ScanoutBufferGenerator* buffer_generator_;  // Not owned.
+  scoped_refptr<DrmThreadMessageProxy> filter_;
 
-  scoped_ptr<DrmGpuDisplayManager> display_manager_;
-  scoped_refptr<IPC::MessageFilter> filter_;
+  DISALLOW_COPY_AND_ASSIGN(DrmGpuPlatformSupport);
 };
 
 }  // namespace ui