Added support to trace_event for passing static string arguments without copy

webkit/glue/webkitclient_impl.cc

Index: webkit/glue/webkitclient_impl.cc
diff --git a/webkit/glue/webkitclient_impl.cc b/webkit/glue/webkitclient_impl.cc
index 792a700af90ca32d4c04b1663eb5532577c9c369..60132dab5d069cc460ef595cfcc0879e1218f98f 100644
--- a/webkit/glue/webkitclient_impl.cc
+++ b/webkit/glue/webkitclient_impl.cc
@@ -290,12 +290,12 @@ void WebKitClientImpl::histogramEnumeration(
 
 void WebKitClientImpl::traceEventBegin(const char* name, void* id,
                                        const char* extra) {
-  TRACE_EVENT_BEGIN_ETW(name, id, extra);
+  TRACE_EVENT_BEGIN_ETW(name, id, std::string(extra));
 }
 
 void WebKitClientImpl::traceEventEnd(const char* name, void* id,
                                      const char* extra) {
-  TRACE_EVENT_END_ETW(name, id, extra);
+  TRACE_EVENT_END_ETW(name, id, std::string(extra));
 }
 
 namespace {