tracing: split trace event filter classes out of TraceLog

base/trace_event/category_registry.h

 // 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.
 
-#ifndef BASE_TRACE_EVENT_CATEGORY_H_
-#define BASE_TRACE_EVENT_CATEGORY_H_
+#ifndef BASE_TRACE_EVENT_CATEGORY_REGISTRY_H_
+#define BASE_TRACE_EVENT_CATEGORY_REGISTRY_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/base_export.h"
 #include "base/logging.h"
 
 namespace base {
 namespace trace_event {
 
@@ skipping 66 matching lines @@
                                         TraceCategory**);
 
   // Allows to iterate over the valid categories in a for-each loop.
   // This includes builtin categories such as __metadata.
   static Range GetAllCategories();
 };
 
 }  // namespace trace_event
 }  // namespace base
 
-#endif  // BASE_TRACE_EVENT_CATEGORY_H_
+#endif  // BASE_TRACE_EVENT_CATEGORY_REGISTRY_H_