Independently enable recording and event callback

webkit/child/webkitplatformsupport_impl.h

Index: webkit/child/webkitplatformsupport_impl.h
diff --git a/webkit/child/webkitplatformsupport_impl.h b/webkit/child/webkitplatformsupport_impl.h
index 40859a224733291cdbc1fbf351f7652d32cb29d2..54e742e32b1a29e75de38a4107d67d2e70163bb7 100644
--- a/webkit/child/webkitplatformsupport_impl.h
+++ b/webkit/child/webkitplatformsupport_impl.h
@@ -87,7 +87,12 @@ class WEBKIT_CHILD_EXPORT WebKitPlatformSupportImpl :
       const unsigned char* arg_types,
       const unsigned long long* arg_values,
       unsigned char flags);
+  // TODO(wangxianzhu): Remove this function after transition to the new one.
   virtual void updateTraceEventDuration(TraceEventHandle);
+  virtual void updateTraceEventDuration(
+      const unsigned char* category_group_enabled,
+      const char* name,
+      TraceEventHandle);
   virtual blink::WebData loadResource(const char* name);
   virtual blink::WebString queryLocalizedString(
       blink::WebLocalizedString::Name name);