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

content/browser/tracing/background_tracing_config_impl.cc

Index: content/browser/tracing/background_tracing_config_impl.cc
diff --git a/content/browser/tracing/background_tracing_config_impl.cc b/content/browser/tracing/background_tracing_config_impl.cc
index cc944ce90ef6a624284c8c43f8fbf29d0f9d2a2f..720656a24dab4517850e176f971d8b3fdb990c08 100644
--- a/content/browser/tracing/background_tracing_config_impl.cc
+++ b/content/browser/tracing/background_tracing_config_impl.cc
@@ -17,6 +17,10 @@ const char kConfigModeKey[] = "mode";
 const char kConfigModePreemptive[] = "PREEMPTIVE_TRACING_MODE";
 const char kConfigModeReactive[] = "REACTIVE_TRACING_MODE";
 
+const char kConfigScenarioName[] = "scenario_name";
+const char kConfigEnableBlinkFeatures[] = "enable_blink_features";
+const char kConfigDisableBlinkFeatures[] = "disable_blink_features";
+
 const char kConfigCategoryKey[] = "category";
 const char kConfigCategoryBenchmark[] = "BENCHMARK";
 const char kConfigCategoryBenchmarkDeep[] = "BENCHMARK_DEEP";
@@ -103,6 +107,13 @@ void BackgroundTracingConfigImpl::IntoDict(base::DictionaryValue* dict) const {
   }
 
   dict->Set(kConfigsKey, configs_list.Pass());
+
+  if (!scenario_name_.empty())
+    dict->SetString(kConfigScenarioName, scenario_name_);
+  if (!enable_blink_features_.empty())
+    dict->SetString(kConfigEnableBlinkFeatures, enable_blink_features_);
+  if (!disable_blink_features_.empty())
+    dict->SetString(kConfigDisableBlinkFeatures, disable_blink_features_);
 }
 
 void BackgroundTracingConfigImpl::AddPreemptiveRule(
@@ -140,6 +151,11 @@ scoped_ptr<BackgroundTracingConfigImpl> BackgroundTracingConfigImpl::FromDict(
     return nullptr;
   }
 
+  dict->GetString(kConfigScenarioName, &config->scenario_name_);
+  dict->GetString(kConfigEnableBlinkFeatures, &config->enable_blink_features_);
+  dict->GetString(kConfigDisableBlinkFeatures,
+                  &config->disable_blink_features_);
+
   return config.Pass();
 }