Switch DRM platform to using a separate thread

ui/ozone/platform/drm/gpu/gbm_surfaceless.cc

Index: ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
diff --git a/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc b/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
index cc713863ef9c33210c462e5c375194d693779cef..b5b47067fe0c10627d25ccd9b3d86cb2c7c457ec 100644
--- a/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
+++ b/ui/ozone/platform/drm/gpu/gbm_surfaceless.cc
@@ -6,10 +6,8 @@
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
-#include "ui/ozone/platform/drm/gpu/drm_device.h"
-#include "ui/ozone/platform/drm/gpu/drm_device_manager.h"
 #include "ui/ozone/platform/drm/gpu/drm_vsync_provider.h"
-#include "ui/ozone/platform/drm/gpu/drm_window.h"
+#include "ui/ozone/platform/drm/gpu/drm_window_proxy.h"
 #include "ui/ozone/platform/drm/gpu/gbm_buffer.h"
 #include "ui/ozone/platform/drm/gpu/hardware_display_controller.h"
 
@@ -19,10 +17,8 @@ void EmptyPageFlipCallback(gfx::SwapResult result) {
 }
 }  // namespace
 
-GbmSurfaceless::GbmSurfaceless(DrmWindow* window,
-                               DrmDeviceManager* drm_device_manager)
-    : window_(window), drm_device_manager_(drm_device_manager) {
-}
+GbmSurfaceless::GbmSurfaceless(scoped_ptr<DrmWindowProxy> window)
+    : window_(window.Pass()) {}
 
 GbmSurfaceless::~GbmSurfaceless() {
 }
@@ -47,23 +43,11 @@ bool GbmSurfaceless::OnSwapBuffersAsync(
 }
 
 scoped_ptr<gfx::VSyncProvider> GbmSurfaceless::CreateVSyncProvider() {
-  return make_scoped_ptr(new DrmVSyncProvider(window_));
+  return make_scoped_ptr(new DrmVSyncProvider(window_.get()));
 }
 
 bool GbmSurfaceless::IsUniversalDisplayLinkDevice() {
-  if (!drm_device_manager_)
-    return false;
-  scoped_refptr<DrmDevice> drm_primary =
-      drm_device_manager_->GetDrmDevice(gfx::kNullAcceleratedWidget);
-  DCHECK(drm_primary);
-
-  HardwareDisplayController* controller = window_->GetController();
-  if (!controller)
-    return false;
-  scoped_refptr<DrmDevice> drm = controller->GetAllocationDrmDevice();
-  DCHECK(drm);
-
-  return drm_primary != drm;
+  return window_->IsDisplayedOnUniversalDisplayLinkDevice();
 }
 
 }  // namespace ui