2 files changed, 11 insertions, 9 deletions

diff --git a/chrome/test/automation/automation_proxy.cc b/chrome/test/automation/automation_proxy.cc
index 8a0ed36..37e173c 100644
--- a/chrome/test/automation/automation_proxy.cc
+++ b/chrome/test/automation/automation_proxy.cc
@@ -404,9 +404,9 @@ void AutomationProxy::ResetChannel() {
     tracker_->put_channel(NULL);
 }
 
-bool AutomationProxy::BeginTracing(const std::string& categories) {
+bool AutomationProxy::BeginTracing(const std::string& category_patterns) {
   bool result = false;
-  bool send_success = Send(new AutomationMsg_BeginTracing(categories,
+  bool send_success = Send(new AutomationMsg_BeginTracing(category_patterns,
                                                           &result));
   return send_success && result;
 }
diff --git a/chrome/test/automation/automation_proxy.h b/chrome/test/automation/automation_proxy.h
index 788a3dc..3dfb7f1 100644
--- a/chrome/test/automation/automation_proxy.h
+++ b/chrome/test/automation/automation_proxy.h
@@ -153,19 +153,21 @@ class AutomationProxy : public IPC::Listener, public AutomationMessageSender {
                        int timeout_ms,
                        std::string* response) WARN_UNUSED_RESULT;
 
-  // Begin tracing specified categories on the browser instance. Blocks until
-  // browser acknowledges that tracing has begun (or failed if false is
-  // returned). |categories| is a comma-delimited list of category wildcards.
-  // A category can have an optional '-' prefix to make it an excluded category.
-  // Either all categories must be included or all must be excluded.
+  // Begin tracing specified category_patterns on the browser instance. Blocks
+  // until browser acknowledges that tracing has begun (or failed if false is
+  // returned). |category_patterns| is a comma-delimited list of category
+  // wildcards.
+  // A category pattern can have an optional '-' prefix to exclude category
+  // groups that contain matching category.
+  // Either all category_patterns must be included or all must be excluded.
   //
   // Example: BeginTracing("test_MyTest*");
   // Example: BeginTracing("test_MyTest*,test_OtherStuff");
   // Example: BeginTracing("-excluded_category1,-excluded_category2");
   //
   // See base/event_trace.h for documentation of included and excluded
-  // categories.
-  bool BeginTracing(const std::string& categories) WARN_UNUSED_RESULT;
+  // category_patterns.
+  bool BeginTracing(const std::string& category_patterns) WARN_UNUSED_RESULT;
 
   // End trace and collect the trace output as a json string.
   bool EndTracing(std::string* json_trace_output) WARN_UNUSED_RESULT;