Expedite discovery of primary DRM device.

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

 // 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.
 
 #include "ui/ozone/platform/drm/host/drm_window_host.h"
 
 #include "base/bind.h"
 #include "ui/display/display.h"
 #include "ui/events/devices/device_data_manager.h"
 #include "ui/events/event.h"
@@ skipping 168 matching lines @@
     location -= gfx::Vector2dF(bounds_.OffsetFromOrigin());
     located_event->set_location_f(location);
     located_event->set_root_location_f(location);
   }
   DispatchEventFromNativeUiEvent(
       native_event, base::Bind(&PlatformWindowDelegate::DispatchEvent,
                                base::Unretained(delegate_)));
   return POST_DISPATCH_STOP_PROPAGATION;
 }
 
+void DrmWindowHost::OnGpuProcessLaunched() {}
+
 void DrmWindowHost::OnGpuThreadReady() {
   sender_->GpuCreateWindow(widget_);
   SendBoundsChange();
 }
 
 void DrmWindowHost::OnGpuThreadRetired() {}
 
 void DrmWindowHost::SendBoundsChange() {
   // Update the cursor before the window so that the cursor stays within the
   // window bounds when the window size shrinks.
   cursor_->CommitBoundsChange(widget_, bounds_, GetCursorConfinedBounds());
   sender_->GpuWindowBoundsChanged(widget_, bounds_);
 
   overlay_manager_->ResetCache();
 }
 
 }  // namespace ui