Trace category groups and category filter.

content/browser/devtools/devtools_tracing_handler.cc

Index: content/browser/devtools/devtools_tracing_handler.cc
diff --git a/content/browser/devtools/devtools_tracing_handler.cc b/content/browser/devtools/devtools_tracing_handler.cc
index 6f8f844762718afd0912e873587df3f591148d34..9c8f40be828528e71223fb6ef5c2eee96fab419f 100644
--- a/content/browser/devtools/devtools_tracing_handler.cc
+++ b/content/browser/devtools/devtools_tracing_handler.cc
@@ -60,10 +60,10 @@ base::Value* DevToolsTracingHandler::OnProtocolCommand(
 
 base::Value* DevToolsTracingHandler::Start(
     const base::DictionaryValue* params) {
-  std::string categories;
+  std::string tag_patterns;
   if (params && params->HasKey("categories"))

[rterrazas, 2013/01/15 08:11:48]

Didn't rename key because I couldn't find where it's set using git grep, maybe
it's in other repo?. Should I even worry about that key?.

-    params->GetString("categories", &categories);
-  TraceController::GetInstance()->BeginTracing(this, categories);
+    params->GetString("categories", &tag_patterns);
+  TraceController::GetInstance()->BeginTracing(this, tag_patterns);
 
   return base::Value::CreateBooleanValue(true);
 }