Support for DIR_SOURCE_ROOT in a case of WebKit-only checkout....

base/base_paths_posix.cc

 // Copyright (c) 2010 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 is really Posix minus Mac. Mac code is in base_paths_mac.mm.
 
 #include "base/base_paths.h"
 
 #include <unistd.h>
 #if defined(OS_FREEBSD)
@@ skipping 64 matching lines @@
       }
       // On POSIX, unit tests execute two levels deep from the source root.
       // For example:  sconsbuild/{Debug|Release}/net_unittest
       if (PathService::Get(base::DIR_EXE, &path)) {
         path = path.DirName().DirName();
         if (file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
           *result = path;
           return true;
         }
       }
+      // In a case of WebKit-only checkout, executable files are put into
+      // WebKit/out/{Debug|Release}, and we should return WebKit/WebKit/chromium
+      // for DIR_SOURCE_ROOT.
+      if (PathService::Get(base::DIR_EXE, &path)) {
+        path = path.DirName().DirName().Append("WebKit/chromium");
+        if (file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
+          *result = path;
+          return true;
+        }
+      }
       // If that failed (maybe the build output is symlinked to a different
       // drive) try assuming the current directory is the source root.
       if (file_util::GetCurrentDirectory(&path) &&
           file_util::PathExists(path.Append("base/base_paths_posix.cc"))) {
         *result = path;
         return true;
       }
       LOG(ERROR) << "Couldn't find your source root.  "
                  << "Try running from your chromium/src directory.";
       return false;
     }
     case base::DIR_USER_CACHE:
       scoped_ptr<base::EnvVarGetter> env(base::EnvVarGetter::Create());
       FilePath cache_dir(base::GetXDGDirectory(env.get(), "XDG_CACHE_HOME",
                                                ".cache"));
       *result = cache_dir;
       return true;
   }
   return false;
 }
 
 }  // namespace base