gn: Support build directories outside the source tree.

tools/gn/label_pattern.cc

 // Copyright 2014 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 "tools/gn/label_pattern.h"
 
 #include "tools/gn/err.h"
 #include "tools/gn/filesystem_utils.h"
 #include "tools/gn/value.h"
 
@@ skipping 148 matching lines @@
   // Resolve the part of the path that's not the wildcard.
   if (!path.empty()) {
     // The non-wildcard stuff better not have a wildcard.
     if (path.find('*') != base::StringPiece::npos) {
       *err = Err(value, "Label patterns only support wildcard suffixes.",
           "The pattern contained a '*' that wasn't at tne end.");
       return LabelPattern();
     }
 
     // Resolve the non-wildcard stuff.
-    dir = current_dir.ResolveRelativeDir(path);
+    dir = current_dir.ResolveRelativeDir(path, base::FilePath());
     if (dir.is_null()) {
       *err = Err(value, "Label pattern didn't resolve to a dir.",
           "The directory name \"" + path.as_string() + "\" didn't\n"
           "resolve to a directory.");
       return LabelPattern();
     }
   }
 
   // Resolve the name. At this point, we're doing wildcard matches so the
   // name should either be empty ("foo/*") or a wildcard ("foo:*");
@@ skipping 58 matching lines @@
       break;
   }
 
   if (!toolchain_.is_null()) {
     result.push_back('(');
     result.append(toolchain_.GetUserVisibleName(false));
     result.push_back(')');
   }
   return result;
 }