ozone-mus: Fix detecting displays on device in mustash.

ui/ozone/platform/drm/mus_thread_proxy.cc

 // Copyright 2016 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/mus_thread_proxy.h"
 
 #include "base/bind.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 56 matching lines @@
                             base::Unretained(this)));
 }
 
 void MusThreadProxy::DispatchObserversFromDrmThread() {
   ws_task_runner_->PostTask(FROM_HERE, base::Bind(&MusThreadProxy::RunObservers,
                                                   base::Unretained(this)));
 }
 
 void MusThreadProxy::RunObservers() {
   DCHECK(on_window_server_thread_.CalledOnValidThread());
-  for (GpuThreadObserver& observer : gpu_thread_observers_)
+  for (GpuThreadObserver& observer : gpu_thread_observers_) {
+    observer.OnGpuProcessLaunched();

[rjkroege, 2016/11/22 17:53:32]

This will obviously be not quite right when we support mojo ozone split-process
mode. Can you add a TODO here before landing reminding someone (probably me) to
do the right thing.

[sadrul, 2016/11/22 18:56:55]

Added TODO

     observer.OnGpuThreadReady();
+  }
 }
 
 void MusThreadProxy::AddGpuThreadObserver(GpuThreadObserver* observer) {
   DCHECK(on_window_server_thread_.CalledOnValidThread());
 
   gpu_thread_observers_.AddObserver(observer);
-  if (IsConnected())
+  if (IsConnected()) {
+    observer->OnGpuProcessLaunched();
     observer->OnGpuThreadReady();
+  }
 }
 
 void MusThreadProxy::RemoveGpuThreadObserver(GpuThreadObserver* observer) {
   DCHECK(on_window_server_thread_.CalledOnValidThread());
   gpu_thread_observers_.RemoveObserver(observer);
 }
 
 bool MusThreadProxy::IsConnected() {
   DCHECK(on_window_server_thread_.CalledOnValidThread());
   base::AutoLock acquire(lock_);
@@ skipping 253 matching lines @@
   display_manager_->GpuReceivedHDCPState(display_id, success, state);
 }
 
 void MusThreadProxy::GpuSetHDCPStateCallback(int64_t display_id,
                                              bool success) const {
   DCHECK(on_window_server_thread_.CalledOnValidThread());
   display_manager_->GpuUpdatedHDCPState(display_id, success);
 }
 
 }  // namespace ui