Background tracing: Tracing scenarios can now enable/disable Blink features, for A/B testing purpos…

content/browser/tracing/background_tracing_config_impl.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 CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_CONFIG_IMPL_H_
 #define CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_CONFIG_IMPL_H_
 
+#include "base/gtest_prod_util.h"
 #include "base/memory/scoped_vector.h"
 #include "content/common/content_export.h"
 #include "content/public/browser/background_tracing_config.h"
 
 namespace content {
 class BackgroundTracingRule;
 
 class CONTENT_EXPORT BackgroundTracingConfigImpl
     : public BackgroundTracingConfig {
  public:
@@ skipping 11 matching lines @@
     BENCHMARK_IPC,
     BENCHMARK_STARTUP,
   };
 
   CategoryPreset category_preset() const { return category_preset_; }
   void set_category_preset(CategoryPreset category_preset) {
     category_preset_ = category_preset;
   }
 
   const ScopedVector<BackgroundTracingRule>& rules() const { return rules_; }
+  const std::string& scenario_name() const { return scenario_name_; }
+  const std::string& enable_blink_features() const {
+    return enable_blink_features_;
+  }
+  const std::string& disable_blink_features() const {
+    return disable_blink_features_;
+  }
 
   void AddPreemptiveRule(const base::DictionaryValue* dict);
   void AddReactiveRule(
       const base::DictionaryValue* dict,
       BackgroundTracingConfigImpl::CategoryPreset category_preset);
 
   static scoped_ptr<BackgroundTracingConfigImpl> PreemptiveFromDict(
       const base::DictionaryValue* dict);
   static scoped_ptr<BackgroundTracingConfigImpl> ReactiveFromDict(
       const base::DictionaryValue* dict);
 
   static scoped_ptr<BackgroundTracingConfigImpl> FromDict(
       const base::DictionaryValue* dict);
 
   static std::string CategoryPresetToString(
       BackgroundTracingConfigImpl::CategoryPreset category_preset);
   static bool StringToCategoryPreset(
       const std::string& category_preset_string,
       BackgroundTracingConfigImpl::CategoryPreset* category_preset);
 
  private:
+  FRIEND_TEST_ALL_PREFIXES(BackgroundTracingConfigTest,
+                           ValidPreemptiveConfigToString);
+
   CategoryPreset category_preset_;
   ScopedVector<BackgroundTracingRule> rules_;
+  std::string scenario_name_;
+  std::string enable_blink_features_;
+  std::string disable_blink_features_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundTracingConfigImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_TRACING_BACKGROUND_TRACING_CONFIG_IMPL_H_