Switch DRM platform to using a separate thread

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

Index: ui/ozone/platform/drm/gpu/drm_thread_proxy.h
diff --git a/ui/ozone/platform/drm/gpu/drm_thread_proxy.h b/ui/ozone/platform/drm/gpu/drm_thread_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..bb9d0a19ebc9d081313ff91778b1db9fe4f72cdf
--- /dev/null
+++ b/ui/ozone/platform/drm/gpu/drm_thread_proxy.h
@@ -0,0 +1,43 @@
+// Copyright 2015 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_GPU_DRM_THREAD_PROXY_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_DRM_THREAD_PROXY_H_
+
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/ozone/platform/drm/gpu/drm_thread.h"
+
+namespace ui {
+
+class DrmDeviceManager;
+class DrmWindowProxy;
+class MessageFilterProxy;
+
+// Mediates the communication between GPU main/IO threads and the DRM thread. It
+// serves proxy objects that are safe to call on the GPU threads. The proxy
+// objects then deal with safely posting the messages to the DRM thread.
+class DrmThreadProxy {
+ public:
+  explicit DrmThreadProxy();
+  ~DrmThreadProxy();
+
+  DrmDeviceManager* device_manager() const {
+    return drm_thread_.device_manager();
+  }
+
+  scoped_refptr<MessageFilterProxy> CreateMessageFilterProxy();

[spang, 2015/09/30 18:17:35]

Do we need to refcount?

[dnicoara, 2015/10/01 14:36:15]

Unfortunately yes, because the base class, IPC::MessageFilter, is ref-counted.

+
+  scoped_ptr<DrmWindowProxy> CreateDrmWindowProxy(
+      gfx::AcceleratedWidget widget);
+
+ private:
+  DrmThread drm_thread_;
+
+  DISALLOW_COPY_AND_ASSIGN(DrmThreadProxy);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_THREAD_PROXY_H_