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

content/browser/tracing/background_tracing_config_impl.h

Index: content/browser/tracing/background_tracing_config_impl.h
diff --git a/content/browser/tracing/background_tracing_config_impl.h b/content/browser/tracing/background_tracing_config_impl.h
index c3ff85cab1ccd3301e2e826ac7e01d9c9bb59d97..03963b2353b27e922d3711512c5cc564d8ba9269 100644
--- a/content/browser/tracing/background_tracing_config_impl.h
+++ b/content/browser/tracing/background_tracing_config_impl.h
@@ -5,6 +5,7 @@
 #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"
@@ -36,6 +37,13 @@ class CONTENT_EXPORT BackgroundTracingConfigImpl
   }
 
   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(
@@ -57,8 +65,14 @@ class CONTENT_EXPORT BackgroundTracingConfigImpl
       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);
 };