Expedite discovery of primary DRM device.

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

 // 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.
 
 #include "ui/ozone/platform/drm/host/drm_display_host.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 93 matching lines @@
 }
 
 void DrmDisplayHost::SetColorCorrection(
     const std::vector<GammaRampRGBEntry>& degamma_lut,
     const std::vector<GammaRampRGBEntry>& gamma_lut,
     const std::vector<float>& correction_matrix) {
   sender_->GpuSetColorCorrection(snapshot_->display_id(), degamma_lut,
                                  gamma_lut, correction_matrix);
 }
 
+void DrmDisplayHost::OnGpuProcessLaunched() {}
+
 void DrmDisplayHost::OnGpuThreadReady() {
   is_dummy_ = false;
 
   // Note: These responses are done here since the OnChannelDestroyed() is
   // called after OnChannelEstablished().
   ClearCallbacks();
 }
 
 void DrmDisplayHost::OnGpuThreadRetired() {}
 
 void DrmDisplayHost::ClearCallbacks() {
   if (!configure_callback_.is_null())
     OnDisplayConfigured(false);
   if (!get_hdcp_callback_.is_null())
     OnHDCPStateReceived(false, HDCP_STATE_UNDESIRED);
   if (!set_hdcp_callback_.is_null())
     OnHDCPStateUpdated(false);
 }
 
 }  // namespace ui