Expedite discovery of primary DRM device.

ui/ozone/platform/drm/host/drm_window_host.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_OZONE_PLATFORM_DRM_HOST_DRM_WINDOW_HOST_H_
 #define UI_OZONE_PLATFORM_DRM_HOST_DRM_WINDOW_HOST_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 62 matching lines @@
   void SetCursor(PlatformCursor cursor) override;
   void MoveCursorTo(const gfx::Point& location) override;
   void ConfineCursorToBounds(const gfx::Rect& bounds) override;
   PlatformImeController* GetPlatformImeController() override;
 
   // PlatformEventDispatcher:
   bool CanDispatchEvent(const PlatformEvent& event) override;
   uint32_t DispatchEvent(const PlatformEvent& event) override;
 
   // GpuThreadObserver:
+  void OnGpuProcessLaunched() override;
   void OnGpuThreadReady() override;
   void OnGpuThreadRetired() override;
 
  private:
   void SendBoundsChange();
 
   PlatformWindowDelegate* delegate_;                   // Not owned.
   GpuThreadAdapter* sender_;                           // Not owned.
   EventFactoryEvdev* event_factory_;                   // Not owned.
   DrmCursor* cursor_;                                  // Not owned.
   DrmWindowHostManager* window_manager_;               // Not owned.
   DrmDisplayHostManager* display_manager_;             // Not owned.
   DrmOverlayManager* overlay_manager_;                 // Not owned.
 
   gfx::Rect bounds_;
   gfx::AcceleratedWidget widget_;
 
   gfx::Rect cursor_confined_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmWindowHost);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_HOST_DRM_WINDOW_HOST_H_