Set up background memory light tracing field trials

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 7220a769f82917cbee12704a2a414cca3959b592..e964cfad5e8a1cc2e4d6d60e16a0a3f0d962a9d6 100644
--- a/content/browser/tracing/background_tracing_config_impl.cc
+++ b/content/browser/tracing/background_tracing_config_impl.cc
@@ -32,6 +32,7 @@ const char kConfigCategoryBenchmarkIPC[] = "BENCHMARK_IPC";
 const char kConfigCategoryBenchmarkStartup[] = "BENCHMARK_STARTUP";
 const char kConfigCategoryBenchmarkBlinkGC[] = "BENCHMARK_BLINK_GC";
 const char kConfigCategoryBenchmarkMemoryHeavy[] = "BENCHMARK_MEMORY_HEAVY";
+const char kConfigCategoryBenchmarkMemoryLight[] = "BENCHMARK_MEMORY_LIGHT";
 const char kConfigCategoryBenchmarkExecutionMetric[] =
     "BENCHMARK_EXECUTION_METRIC";
 const char kConfigCategoryBlinkStyle[] = "BLINK_STYLE";
@@ -62,6 +63,8 @@ std::string BackgroundTracingConfigImpl::CategoryPresetToString(
       return kConfigCategoryBenchmarkBlinkGC;
     case BackgroundTracingConfigImpl::BENCHMARK_MEMORY_HEAVY:
       return kConfigCategoryBenchmarkMemoryHeavy;
+    case BackgroundTracingConfigImpl::BENCHMARK_MEMORY_LIGHT:
+      return kConfigCategoryBenchmarkMemoryLight;
     case BackgroundTracingConfigImpl::BENCHMARK_EXECUTION_METRIC:
       return kConfigCategoryBenchmarkExecutionMetric;
     case BackgroundTracingConfigImpl::BLINK_STYLE:
@@ -111,6 +114,11 @@ bool BackgroundTracingConfigImpl::StringToCategoryPreset(
     return true;
   }
 
+  if (category_preset_string == kConfigCategoryBenchmarkMemoryLight) {
+    *category_preset = BackgroundTracingConfigImpl::BENCHMARK_MEMORY_LIGHT;
+    return true;
+  }
+
   if (category_preset_string == kConfigCategoryBenchmarkExecutionMetric) {
     *category_preset = BackgroundTracingConfigImpl::BENCHMARK_EXECUTION_METRIC;
     return true;