Added support to trace_event for passing static string arguments without copy

webkit/tools/test_shell/test_webview_delegate.cc

Index: webkit/tools/test_shell/test_webview_delegate.cc
diff --git a/webkit/tools/test_shell/test_webview_delegate.cc b/webkit/tools/test_shell/test_webview_delegate.cc
index 3b107a11b25074a7d2240cc26bb6dd25cb50ff5b..d898a55ef360e54610e1a89bf2e12991644ca9f8 100644
--- a/webkit/tools/test_shell/test_webview_delegate.cc
+++ b/webkit/tools/test_shell/test_webview_delegate.cc
@@ -824,7 +824,8 @@ void TestWebViewDelegate::didFailLoad(
 }
 
 void TestWebViewDelegate::didFinishLoad(WebFrame* frame) {
-  TRACE_EVENT_END_ETW("frame.load", this, frame->document().url().spec());
+  TRACE_EVENT_END_ETW("frame.load", this,
+                      std::string(frame->document().url().spec()));
   UpdateAddressBar(frame->view());
   LocationChangeDone(frame);
 }