Added support to trace_event for passing static string arguments without copy

webkit/tools/test_shell/test_webview_delegate.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file contains the implementation of TestWebViewDelegate, which serves
 // as the WebViewDelegate for the TestShellWebHost.  The host is expected to
 // have initialized a MessageLoop before these methods are called.
 
 #include "webkit/tools/test_shell/test_webview_delegate.h"
 
@@ skipping 806 matching lines @@
 
 void TestWebViewDelegate::didHandleOnloadEvents(WebFrame* frame) {
 }
 
 void TestWebViewDelegate::didFailLoad(
     WebFrame* frame, const WebURLError& error) {
   LocationChangeDone(frame);
 }
 
 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);
 }
 
 void TestWebViewDelegate::didNavigateWithinPage(
     WebFrame* frame, bool is_new_navigation) {
   frame->dataSource()->setExtraData(pending_extra_data_.release());
 
   UpdateForCommittedLoad(frame, is_new_navigation);
 }
@@ skipping 287 matching lines @@
 }
 
 void TestWebViewDelegate::set_fake_window_rect(const WebRect& rect) {
   fake_rect_ = rect;
   using_fake_rect_ = true;
 }
 
 WebRect TestWebViewDelegate::fake_window_rect() {
   return fake_rect_;
 }