Add "bundle_data" target as first step for adding bundle support to gn.

tools/gn/target.h

 // Copyright (c) 2013 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.
 
 #ifndef TOOLS_GN_TARGET_H_
 #define TOOLS_GN_TARGET_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 26 matching lines @@
     UNKNOWN,
     GROUP,
     EXECUTABLE,
     SHARED_LIBRARY,
     LOADABLE_MODULE,
     STATIC_LIBRARY,
     SOURCE_SET,
     COPY_FILES,
     ACTION,
     ACTION_FOREACH,
+    BUNDLE_DATA,
   };
 
   enum DepsIterationType {
     DEPS_ALL,  // Iterates through all public, private, and data deps.
     DEPS_LINKED,  // Iterates through all non-data dependencies.
   };
 
   typedef std::vector<SourceFile> FileList;
   typedef std::vector<std::string> StringVector;
 
@@ skipping 295 matching lines @@
   // Output files. Empty until the target is resolved.
   std::vector<OutputFile> computed_outputs_;
   OutputFile link_output_file_;
   OutputFile dependency_output_file_;
   OutputFile runtime_link_output_file_;
 
   DISALLOW_COPY_AND_ASSIGN(Target);
 };
 
 #endif  // TOOLS_GN_TARGET_H_