Hack to make tests work if out is a symlink: see if the current dir is the source root.

webkit/tools/test_shell/test_shell_gtk.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 "webkit/tools/test_shell/test_shell.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <fontconfig/fontconfig.h>
 #include <gtk/gtk.h>
@@ skipping 611 matching lines @@
 
 // static
 std::string TestShell::RewriteLocalUrl(const std::string& url) {
   // Convert file:///tmp/LayoutTests urls to the actual location on disk.
   const char kPrefix[] = "file:///tmp/LayoutTests/";
   const int kPrefixLen = arraysize(kPrefix) - 1;
 
   std::string new_url(url);
   if (url.compare(0, kPrefixLen, kPrefix, kPrefixLen) == 0) {
     FilePath replace_path;
-    PathService::Get(base::DIR_EXE, &replace_path);
-    replace_path = replace_path.DirName().DirName().Append(
+    PathService::Get(base::DIR_SOURCE_ROOT, &replace_path);
+    replace_path = replace_path.Append(
         "webkit/data/layout_tests/LayoutTests/");
     new_url = std::string("file://") + replace_path.value() +
         url.substr(kPrefixLen);
   }
 
   return new_url;
 }
 
 // static
 void TestShell::ShowStartupDebuggingDialog() {
@@ skipping 42 matching lines @@
       break;
   }
   return TestShell::NetResourceProvider(resource_id);
 }
 
 void GetPlugins(bool refresh, std::vector<WebPluginInfo>* plugins) {
   NPAPI::PluginList::Singleton()->GetPlugins(refresh, plugins);
 }
 
 }  // namespace webkit_glue