Expedite discovery of primary DRM device.

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

Index: ui/ozone/platform/drm/host/drm_gpu_platform_support_host.h
diff --git a/ui/ozone/platform/drm/host/drm_gpu_platform_support_host.h b/ui/ozone/platform/drm/host/drm_gpu_platform_support_host.h
index 2cc4a176f43b43070190032033f8a8e1fe196a5e..d797630e01896b5abe1927d3581efdc57163682b 100644
--- a/ui/ozone/platform/drm/host/drm_gpu_platform_support_host.h
+++ b/ui/ozone/platform/drm/host/drm_gpu_platform_support_host.h
@@ -36,10 +36,11 @@ class DrmGpuPlatformSupportHost : public GpuPlatformSupportHost,
   ~DrmGpuPlatformSupportHost() override;
 
   // GpuPlatformSupportHost:
-  void OnChannelEstablished(
+  void OnGpuProcessLaunched(
       int host_id,
       scoped_refptr<base::SingleThreadTaskRunner> send_runner,
       const base::Callback<void(IPC::Message*)>& send_callback) override;
+  void OnChannelEstablished() override;
   void OnChannelDestroyed(int host_id) override;
 
   // IPC::Listener:
@@ -110,6 +111,7 @@ class DrmGpuPlatformSupportHost : public GpuPlatformSupportHost,
                        const std::vector<OverlayCheck_Params>& params);
 
   int host_id_ = -1;
+  bool channel_established_ = false;
 
   scoped_refptr<base::SingleThreadTaskRunner> send_runner_;
   base::Callback<void(IPC::Message*)> send_callback_;