Tracing pre-filtering

base/trace_event/trace_config.h

Index: base/trace_event/trace_config.h
diff --git a/base/trace_event/trace_config.h b/base/trace_event/trace_config.h
index 5b119eae98c0d71a97016ab44d0e06d915d67c84..e91acbe70ac3a089fcb7478b1ac633e94d1b9d60 100644
--- a/base/trace_event/trace_config.h
+++ b/base/trace_event/trace_config.h
@@ -73,6 +73,37 @@ class BASE_EXPORT TraceConfig {
     HeapProfiler heap_profiler_options;
   };
 
+  class EventFilterConfig {
+   public:
+    EventFilterConfig(const std::string& predicate_name);
+    ~EventFilterConfig();
+
+    EventFilterConfig(const EventFilterConfig& tc);
+    EventFilterConfig& operator=(const EventFilterConfig& rhs);
+
+    void AddIncludedCategory(const std::string& category);
+    void AddExcludedCategory(const std::string& category);
+    void SetArgs(std::unique_ptr<base::DictionaryValue> args);

[Primiano Tucci (use gerrit), 2016/05/27 17:47:06]

nit: you are in base, no need for base::

+
+    bool IsCategoryGroupEnabled(const char* category_group_name) const;
+
+    const std::string& predicate_name() const { return predicate_name_; }
+    base::DictionaryValue* filter_args() const { return args_.get(); }

[Primiano Tucci (use gerrit), 2016/05/27 17:47:06]

maybe you want this to be a const DictValue*?
ditto for base::

+    const StringList& included_categories() const {
+      return included_categories_;
+    }
+    const StringList& excluded_categories() const {
+      return excluded_categories_;
+    }
+
+   private:
+    std::string predicate_name_;
+    StringList included_categories_;
+    StringList excluded_categories_;
+    std::unique_ptr<base::DictionaryValue> args_;
+  };
+  typedef std::vector<EventFilterConfig> EventFilters;
+
   TraceConfig();
 
   // Create TraceConfig object from category filter and trace options strings.
@@ -189,7 +220,7 @@ class BASE_EXPORT TraceConfig {
 
   // Returns true if at least one category in the list is enabled by this
   // trace config.
-  bool IsCategoryGroupEnabled(const char* category_group) const;
+  bool IsCategoryGroupEnabled(const char* category_group_name) const;
 
   // Merges config with the current TraceConfig
   void Merge(const TraceConfig& config);
@@ -200,6 +231,8 @@ class BASE_EXPORT TraceConfig {
     return memory_dump_config_;
   }
 
+  const EventFilters& event_filters() const { return event_filters_; }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest, TraceConfigFromValidLegacyFormat);
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest,
@@ -238,6 +271,8 @@ class BASE_EXPORT TraceConfig {
   void SetMemoryDumpConfig(const base::DictionaryValue& memory_dump_config);
   void SetDefaultMemoryDumpConfig();
 
+  void SetEventFilters(const base::ListValue& event_filters);
+
   // Convert TraceConfig to the dict representation of the TraceConfig.
   void ToDict(base::DictionaryValue& dict) const;
 
@@ -268,6 +303,7 @@ class BASE_EXPORT TraceConfig {
   StringList disabled_categories_;
   StringList excluded_categories_;
   StringList synthetic_delays_;
+  EventFilters event_filters_;
 };
 
 }  // namespace trace_event