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 72ca5f868785691b7686fef576f6eb59218c4592..e38175ac8d242caf968c31c6643408c5f050dccc 100644
--- a/base/trace_event/trace_config.h
+++ b/base/trace_event/trace_config.h
@@ -46,9 +46,39 @@ class BASE_EXPORT TraceConfig {
     uint32_t periodic_interval_ms;
     MemoryDumpLevelOfDetail level_of_detail;
   };
-
   typedef std::vector<MemoryDumpTriggerConfig> MemoryDumpConfig;
 
+  class CategoryEventFilterConfig {
+   public:
+    CategoryEventFilterConfig(const std::string& predicate_name);
+    ~CategoryEventFilterConfig();
+
+    CategoryEventFilterConfig(const CategoryEventFilterConfig& tc);
+    CategoryEventFilterConfig& operator=(const CategoryEventFilterConfig& rhs);
+
+    void AddIncludedCategory(const std::string& category);
+    void AddExcludedCategory(const std::string& category);
+    void SetArgs(std::unique_ptr<base::DictionaryValue> args);
+
+    bool IsCategoryGroupEnabled(const char* category_group_name) const;
+
+    const std::string& predicate_name() const { return predicate_name_; }
+    base::DictionaryValue* args() const { return args_.get(); }
+    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<CategoryEventFilterConfig> CategoryEventFilters;
+
   TraceConfig();
 
   // Create TraceConfig object from category filter and trace options strings.
@@ -165,7 +195,7 @@ 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);
@@ -176,6 +206,10 @@ class BASE_EXPORT TraceConfig {
     return memory_dump_config_;
   }
 
+  const CategoryEventFilters& category_event_filters() const {
+    return category_event_filters_;
+  }
+
  private:
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest, TraceConfigFromValidLegacyFormat);
   FRIEND_TEST_ALL_PREFIXES(TraceConfigTest,
@@ -214,6 +248,8 @@ class BASE_EXPORT TraceConfig {
   void SetMemoryDumpConfig(const base::DictionaryValue& memory_dump_config);
   void SetDefaultMemoryDumpConfig();
 
+  void SetCategoryEventFilters(const base::ListValue& category_event_filters);
+
   // Convert TraceConfig to the dict representation of the TraceConfig.
   void ToDict(base::DictionaryValue& dict) const;
 
@@ -244,6 +280,7 @@ class BASE_EXPORT TraceConfig {
   StringList disabled_categories_;
   StringList excluded_categories_;
   StringList synthetic_delays_;
+  CategoryEventFilters category_event_filters_;
 };
 
 }  // namespace trace_event