Set up background memory light tracing field trials

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 <string>
@@ skipping 24 matching lines @@
   // Echo to console. Events are discarded.
   ECHO_TO_CONSOLE,
 };
 
 class BASE_EXPORT TraceConfig {
  public:
   typedef std::vector<std::string> StringList;
 
   // Specifies the memory dump config for tracing.
   // Used only when "memory-infra" category is enabled.
-  struct MemoryDumpConfig {
+  struct BASE_EXPORT MemoryDumpConfig {
     MemoryDumpConfig();
     MemoryDumpConfig(const MemoryDumpConfig& other);
     ~MemoryDumpConfig();
 
     // Specifies the triggers in the memory dump config.
     struct Trigger {
       uint32_t periodic_interval_ms;
       MemoryDumpLevelOfDetail level_of_detail;
     };
 
@@ skipping 133 matching lines @@
 
   // Returns true if at least one category in the list is enabled by this
   // trace config.
   bool IsCategoryGroupEnabled(const char* category_group) 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 MemoryDumpConfig& memory_dump_config() const {
     return memory_dump_config_;
   }
 
  private:
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest, TraceConfigFromValidLegacyFormat);
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest,
                            TraceConfigFromInvalidLegacyStrings);
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest, ConstructDefaultTraceConfig);
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest, TraceConfigFromValidString);
@@ skipping 19 matching lines @@
   void InitializeFromStrings(const std::string& category_filter_string,
                              const std::string& trace_options_string);
 
   void SetCategoriesFromIncludedList(const base::ListValue& included_list);
   void SetCategoriesFromExcludedList(const base::ListValue& excluded_list);
   void SetSyntheticDelaysFromList(const base::ListValue& list);
   void AddCategoryToDict(base::DictionaryValue& dict,
                          const char* param,
                          const StringList& categories) const;
 
-  void SetMemoryDumpConfig(const base::DictionaryValue& memory_dump_config);
+  void SetMemoryDumpConfigFromConfigDict(
+      const base::DictionaryValue& memory_dump_config);
   void SetDefaultMemoryDumpConfig();
 
   // Convert TraceConfig to the dict representation of the TraceConfig.
   void ToDict(base::DictionaryValue& dict) const;
 
   std::string ToTraceOptionsString() const;
 
   void WriteCategoryFilterString(const StringList& values,
                                  std::string* out,
                                  bool included) const;
@@ skipping 18 matching lines @@
   StringList included_categories_;
   StringList disabled_categories_;
   StringList excluded_categories_;
   StringList synthetic_delays_;
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_TRACE_CONFIG_H_