GN: Fix dependency output file handling.

tools/gn/substitution_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/substitution_pattern.h"
 
 #include "base/strings/string_number_conversions.h"
 #include "tools/gn/build_settings.h"
 #include "tools/gn/err.h"
 #include "tools/gn/filesystem_utils.h"
@@ skipping 73 matching lines @@
 
   origin_ = origin;
 
   // Fill required types vector.
   SubstitutionBits bits;
   FillRequiredTypes(&bits);
   bits.FillVector(&required_types_);
   return true;
 }
 
+// static
+SubstitutionPattern SubstitutionPattern::MakeForTest(const char* str) {
+  Err err;
+  SubstitutionPattern pattern;
+  CHECK(pattern.Parse(str, NULL, &err)) << err.message();
+  return pattern;
+}
+
 std::string SubstitutionPattern::AsString() const {
   std::string result;
   for (size_t i = 0; i < ranges_.size(); i++) {
     if (ranges_[i].type == SUBSTITUTION_LITERAL)
       result.append(ranges_[i].literal);
     else
       result.append(kSubstitutionNames[ranges_[i].type]);
   }
   return result;
 }
@@ skipping 26 matching lines @@
           "File is not inside output directory.",
           "The given file should be in the output directory. Normally you\n"
           "would specify\n\"$target_out_dir/foo\" or "
           "\"{{source_gen_dir}}/foo\".");
       return false;
     }
   }
 
   return true;
 }