Add "create_bundle" target in order to support bundle with gn.

tools/gn/substitution_type.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_type.h"
 
 #include <stddef.h>
 #include <stdlib.h>
 
 #include "tools/gn/err.h"
@@ skipping 190 matching lines @@
   // All valid compiler outputs plus the output extension.
   return IsValidCompilerOutputsSubstitution(type) ||
          type == SUBSTITUTION_OUTPUT_EXTENSION;
 }
 
 bool IsValidCopySubstitution(SubstitutionType type) {
   return IsValidToolSubstitution(type) ||
          type == SUBSTITUTION_SOURCE;
 }
 
+bool IsValidCompileXCassetsSubstitution(SubstitutionType type) {
+  return IsValidToolSubstitution(type) ||
+         type == SUBSTITUTION_LINKER_INPUTS;
+}
+
 bool EnsureValidSourcesSubstitutions(
     const std::vector<SubstitutionType>& types,
     const ParseNode* origin,
     Err* err) {
   for (size_t i = 0; i < types.size(); i++) {
     if (!IsValidSourceSubstitution(types[i])) {
       *err = Err(origin, "Invalid substitution type.",
           "The substitution " + std::string(kSubstitutionNames[types[i]]) +
           " isn't valid for something\n"
           "operating on a source file such as this.");
       return false;
     }
   }
   return true;
 }