POSIX: add command line option to launch renderers in a wrapper

chrome/common/chrome_switches.cc

 // Copyright (c) 2006-2008 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.
 
 #include "chrome/common/chrome_switches.h"
 
 #include "base/base_switches.h"
 
 namespace switches {
 
@@ skipping 353 matching lines @@
 // Turns on the accessibility in the renderer.  Off by default until
 // http://b/issue?id=1432077 is fixed.
 const wchar_t kEnableRendererAccessibility[] = L"enable-renderer-accessibility";
 
 // Enable HTML5 Video/Audio tag support
 const wchar_t kEnableVideo[]                   = L"enable-video";
 
 // Pass the name of the current running automated test to Chrome.
 const wchar_t kTestName[]                      = L"test-name";
 
+// On POSIX only: the contents of this flag are prepended to the renderer
+// command line. (Useful values might be "valgrind" or "gdb --args")
+const wchar_t kRendererCmdPrefix[]             = L"renderer-cmd-prefix";
+
 }  // namespace switches