Background tracing: Added preset category for blink_style

R=simonhatch
BUG=546193

Review URL: https://codereview.chromium.org/1423133007

Cr-Commit-Position: refs/heads/master@{#357113}

content/browser/tracing/background_tracing_config_impl.cc

@@ -27,6 +27,7 @@ const char kConfigCategoryBenchmarkDeep[] = "BENCHMARK_DEEP";
 const char kConfigCategoryBenchmarkGPU[] = "BENCHMARK_GPU";
 const char kConfigCategoryBenchmarkIPC[] = "BENCHMARK_IPC";
 const char kConfigCategoryBenchmarkStartup[] = "BENCHMARK_STARTUP";
+const char kConfigCategoryBlinkStyle[] = "BLINK_STYLE";
 
 }  // namespace
 
@@ -50,6 +51,8 @@ std::string BackgroundTracingConfigImpl::CategoryPresetToString(
       return kConfigCategoryBenchmarkIPC;
     case BackgroundTracingConfigImpl::BENCHMARK_STARTUP:
       return kConfigCategoryBenchmarkStartup;
+    case BackgroundTracingConfigImpl::BLINK_STYLE:
+      return kConfigCategoryBlinkStyle;
   }
   NOTREACHED();
   return "";
@@ -83,6 +86,11 @@ bool BackgroundTracingConfigImpl::StringToCategoryPreset(
     return true;
   }
 
+  if (category_preset_string == kConfigCategoryBlinkStyle) {
+    *category_preset = BackgroundTracingConfigImpl::BLINK_STYLE;
+    return true;
+  }
+
   return false;
 }
 

content/browser/tracing/background_tracing_config_impl.h

@@ -29,6 +29,7 @@ class CONTENT_EXPORT BackgroundTracingConfigImpl
     BENCHMARK_GPU,
     BENCHMARK_IPC,
     BENCHMARK_STARTUP,
+    BLINK_STYLE
   };
 
   CategoryPreset category_preset() const { return category_preset_; }

content/browser/tracing/background_tracing_manager_impl.cc

@@ -583,6 +583,8 @@ BackgroundTracingManagerImpl::GetCategoryFilterStringForCategoryPreset(
       return "benchmark,toplevel,startup,disabled-by-default-file,"
              "disabled-by-default-toplevel.flow,"
              "disabled-by-default-ipc.flow";
+    case BackgroundTracingConfigImpl::CategoryPreset::BLINK_STYLE:
+      return "blink_style";
   }
   NOTREACHED();
   return "";