Reland: Avoid calling strlen() where possible in base/trace_config

base/trace_event/trace_config.h

 // 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.
 
 #ifndef BASE_TRACE_EVENT_TRACE_CONFIG_H_
 #define BASE_TRACE_EVENT_TRACE_CONFIG_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 85 matching lines @@
     EventFilterConfig& operator=(const EventFilterConfig& rhs);
 
     void InitializeFromConfigDict(const base::DictionaryValue* event_filter);
 
     void SetCategoryFilter(const TraceConfigCategoryFilter& category_filter);
 
     void ToDict(DictionaryValue* filter_dict) const;
 
     bool GetArgAsSet(const char* key, std::unordered_set<std::string>*) const;
 
-    bool IsCategoryGroupEnabled(const char* category_group_name) const;
+    bool IsCategoryGroupEnabled(const StringPiece& category_group_name) const;
 
     const std::string& predicate_name() const { return predicate_name_; }
     base::DictionaryValue* filter_args() const { return args_.get(); }
     const TraceConfigCategoryFilter& category_filter() const {
       return category_filter_;
     }
 
    private:
     std::string predicate_name_;
     TraceConfigCategoryFilter category_filter_;
@@ skipping 107 matching lines @@
 
   // Returns a copy of the TraceConfig wrapped in a ConvertableToTraceFormat
   std::unique_ptr<ConvertableToTraceFormat> AsConvertableToTraceFormat() const;
 
   // Write the string representation of the CategoryFilter part.
   std::string ToCategoryFilterString() const;
 
   // Returns true if at least one category in the list is enabled by this
   // trace config. This is used to determine if the category filters are
   // enabled in the TRACE_* macros.
-  bool IsCategoryGroupEnabled(const char* category_group_name) const;
+  bool IsCategoryGroupEnabled(const StringPiece& category_group_name) const;
 
   // Merges config with the current TraceConfig
   void Merge(const TraceConfig& config);
 
   void Clear();
 
   // Clears and resets the memory dump config.
   void ResetMemoryDumpConfig(const MemoryDumpConfig& memory_dump_config);
 
   const TraceConfigCategoryFilter& category_filter() const {
@@ skipping 46 matching lines @@
 
   MemoryDumpConfig memory_dump_config_;
 
   EventFilters event_filters_;
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_CONFIG_H_