Make ozone/drm/mojo more immune to startup races

ui/ozone/platform/drm/cursor_proxy_mojo.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/cursor_proxy_mojo.h"
 
 #include "services/service_manager/public/cpp/connector.h"
 #include "services/ui/public/interfaces/constants.mojom.h"
 
 namespace ui {
 
 CursorProxyMojo::CursorProxyMojo(service_manager::Connector* connector)
     : connector_(connector->Clone()) {
   connector->BindInterface(ui::mojom::kServiceName, &main_cursor_ptr_);
 }
 
 void CursorProxyMojo::InitializeOnEvdev() {
   evdev_ref_ = base::PlatformThread::CurrentRef();
   connector_->BindInterface(ui::mojom::kServiceName, &evdev_cursor_ptr_);
 }
 
 CursorProxyMojo::~CursorProxyMojo() {}
 
 void CursorProxyMojo::CursorSet(gfx::AcceleratedWidget widget,
                                 const std::vector<SkBitmap>& bitmaps,
                                 const gfx::Point& location,
                                 int frame_delay_ms) {
+  if (!have_gpu_thread_)
+    return;
   if (evdev_ref_ == base::PlatformThread::CurrentRef()) {
     evdev_cursor_ptr_->SetCursor(widget, bitmaps, location, frame_delay_ms);
   } else {
     main_cursor_ptr_->SetCursor(widget, bitmaps, location, frame_delay_ms);
   }
 }
 
 void CursorProxyMojo::Move(gfx::AcceleratedWidget widget,
                            const gfx::Point& location) {
+  if (!have_gpu_thread_)
+    return;
   if (evdev_ref_ == base::PlatformThread::CurrentRef()) {
     evdev_cursor_ptr_->MoveCursor(widget, location);
   } else {
     main_cursor_ptr_->MoveCursor(widget, location);
   }
 }
 
+void CursorProxyMojo::OnGpuProcessLaunched() {}
+
+void CursorProxyMojo::OnGpuThreadReady() {
+  have_gpu_thread_ = true;
+}
+
+void CursorProxyMojo::OnGpuThreadRetired() {
+  have_gpu_thread_ = false;
+}
+
 }  // namespace ui