Turn ThreadPriority enum into an enum class.

content/gpu/gpu_child_thread.cc

 // Copyright (c) 2012 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 "content/gpu/gpu_child_thread.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/threading/worker_pool.h"
 #include "build/build_config.h"
@@ skipping 148 matching lines @@
     deferred_messages_.pop();
   }
 
   if (dead_on_arrival_) {
     LOG(ERROR) << "Exiting GPU process due to errors during initialization";
     base::MessageLoop::current()->Quit();
     return;
   }
 
 #if defined(OS_ANDROID)
-  base::PlatformThread::SetThreadPriority(
-      base::PlatformThread::CurrentHandle(),
-      base::kThreadPriority_Display);
+  base::PlatformThread::SetThreadPriority(base::PlatformThread::CurrentHandle(),
+                                          base::ThreadPriority::DISPLAY);
 #endif
 
   // We don't need to pipe log messages if we are running the GPU thread in
   // the browser process.
   if (!in_browser_process_)
     logging::SetLogMessageHandler(GpuProcessLogMessageHandler);
 
   // Defer creation of the render thread. This is to prevent it from handling
   // IPC messages before the sandbox has been enabled and all other necessary
   // initialization has succeeded.
@@ skipping 104 matching lines @@
 }
 
 void GpuChildThread::OnGpuSwitched() {
   DVLOG(1) << "GPU: GPU has switched";
   // Notify observers in the GPU process.
   ui::GpuSwitchingManager::GetInstance()->NotifyGpuSwitched();
 }
 
 }  // namespace content