[Chromecast] Add input support.

ui/events/ozone/evdev/event_thread_evdev.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/events/ozone/evdev/event_thread_evdev.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/callback.h"
@@ skipping 25 matching lines @@
 
   void Init() override {
     TRACE_EVENT0("evdev", "EvdevThread::Init");
     input_device_factory_ =
         new InputDeviceFactoryEvdev(std::move(dispatcher_), cursor_);
 
     std::unique_ptr<InputDeviceFactoryEvdevProxy> proxy(
         new InputDeviceFactoryEvdevProxy(base::ThreadTaskRunnerHandle::Get(),
                                          input_device_factory_->GetWeakPtr()));
 
-    cursor_->InitializeOnEvdev();
+    if (cursor_)
+      cursor_->InitializeOnEvdev();
 
     init_runner_->PostTask(FROM_HERE,
                            base::Bind(init_callback_, base::Passed(&proxy)));
   }
 
   void CleanUp() override {
     TRACE_EVENT0("evdev", "EvdevThread::CleanUp");
     delete input_device_factory_;
   }
 
@@ skipping 23 matching lines @@
   TRACE_EVENT0("evdev", "EventThreadEvdev::Start");
   thread_.reset(new EvdevThread(std::move(dispatcher), cursor, callback));
   base::Thread::Options thread_options;
   thread_options.message_loop_type = base::MessageLoop::TYPE_UI;
   thread_options.priority = base::ThreadPriority::DISPLAY;
   if (!thread_->StartWithOptions(thread_options))
     LOG(FATAL) << "Failed to create input thread";
 }
 
 }  // namespace ui