content: Implement dynamic priorities for raster threads.

base/threading/platform_thread_win.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 "base/threading/platform_thread.h"
 
 #include <stddef.h>
 
 #include "base/debug/alias.h"
 #include "base/debug/profiler.h"
@@ skipping 263 matching lines @@
     case THREAD_PRIORITY_TIME_CRITICAL:
       return ThreadPriority::REALTIME_AUDIO;
     case THREAD_PRIORITY_ERROR_RETURN:
       DPCHECK(false) << "GetThreadPriority error";  // Falls through.
     default:
       NOTREACHED() << "Unexpected priority: " << priority;
       return ThreadPriority::NORMAL;
   }
 }
 
+// static
+bool PlatformThread::SetChildThreadPriorityInCurrentProcess(
+    PlatformThreadHandle thread_handle,
+    PlatformThreadId tid,
+    ThreadPriority priority) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
 }  // namespace base