Turn ThreadPriority enum into an enum class.

cc/resources/tile_task_worker_pool.cc

 // Copyright 2013 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 "cc/resources/tile_task_worker_pool.h"
 
 #include <algorithm>
 
 #include "base/lazy_instance.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/simple_thread.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/scoped_ptr_deque.h"
 #include "cc/resources/raster_source.h"
 #include "skia/ext/refptr.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkSurface.h"
 
 namespace cc {
 namespace {
 
-base::ThreadPriority g_worker_thread_priority = base::kThreadPriority_Normal;
+base::ThreadPriority g_worker_thread_priority = base::ThreadPriority::NORMAL;
 
 class TileTaskGraphRunner : public TaskGraphRunner,
                             public base::DelegateSimpleThread::Delegate {
  public:
   TileTaskGraphRunner() {
     size_t num_threads = TileTaskWorkerPool::GetNumWorkerThreads();
     while (workers_.size() < num_threads) {
       scoped_ptr<base::DelegateSimpleThread> worker =
           make_scoped_ptr(new base::DelegateSimpleThread(
               this, base::StringPrintf(
@@ skipping 230 matching lines @@
   // TODO(kaanb): The GL pipeline assumes a 4-byte alignment for the
   // bitmap data. There will be no need to call SkAlign4 once crbug.com/293728
   // is fixed.
   const size_t dst_row_bytes = SkAlign4(dst_info.minRowBytes());
   DCHECK_EQ(0u, dst_row_bytes % 4);
   bool success = canvas->readPixels(dst_info, memory, dst_row_bytes, 0, 0);
   DCHECK_EQ(true, success);
 }
 
 }  // namespace cc