Expedite discovery of primary DRM device.

ui/ozone/platform/drm/host/drm_display_host.h

 // 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_HOST_DRM_DISPLAY_HOST_H_
 #define UI_OZONE_PLATFORM_DRM_HOST_DRM_DISPLAY_HOST_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 26 matching lines @@
                           const std::vector<GammaRampRGBEntry>& gamma_lut,
                           const std::vector<float>& correction_matrix);
 
   // Called when the IPC from the GPU process arrives to answer the above
   // commands.
   void OnDisplayConfigured(bool status);
   void OnHDCPStateReceived(bool status, HDCPState state);
   void OnHDCPStateUpdated(bool status);
 
   // GpuThreadObserver:
+  void OnGpuProcessLaunched() override;
   void OnGpuThreadReady() override;
   void OnGpuThreadRetired() override;
 
  private:
   // Calls all the callbacks with failure.
   void ClearCallbacks();
 
   GpuThreadAdapter* sender_;  // Not owned.
 
   std::unique_ptr<DisplaySnapshot> snapshot_;
 
   // Used during startup to signify that any display configuration should be
   // synchronous and succeed.
   bool is_dummy_;
 
   ConfigureCallback configure_callback_;
   GetHDCPStateCallback get_hdcp_callback_;
   SetHDCPStateCallback set_hdcp_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(DrmDisplayHost);
 };
 
 }  // namespace ui
 
 #endif  // UI_OZONE_PLATFORM_DRM_HOST_DRM_DISPLAY_HOST_H_