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

tools/gn/functions_target.cc

 // 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.
 
 #include "tools/gn/functions.h"
 
 #include "tools/gn/config_values_generator.h"
 #include "tools/gn/err.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scope.h"
@@ skipping 225 matching lines @@
     "\n";
 Value RunActionForEach(Scope* scope,
                        const FunctionCallNode* function,
                        const std::vector<Value>& args,
                        BlockNode* block,
                        Err* err) {
   return ExecuteGenericTarget(functions::kActionForEach, scope, function, args,
                               block, err);
 }
 
+// bundle_data -----------------------------------------------------------------
+
+const char kBundleData[] = "bundle_data";
+const char kBundleData_HelpShort[] =
+    "bundle_data: Declare a target without output.";
+const char kBundleData_Help[] =
+    "bundle_data: Declare a target without output.\n"
+    "\n"
+    "  This target type allows to declare data that is required at runtime.\n"
+    "  It is used to inform \"create_bundle\" targets of the files to copy\n"
+    "  into generated bundle, see \"gn help create_bundle\" for help.\n";
+
+Value RunBundleData(Scope* scope,
+                    const FunctionCallNode* function,
+                    const std::vector<Value>& args,
+                    BlockNode* block,
+                    Err* err) {
+  return ExecuteGenericTarget(functions::kBundleData, scope, function, args,
+                              block, err);
+}
+
 // copy ------------------------------------------------------------------------
 
 const char kCopy[] = "copy";
 const char kCopy_HelpShort[] =
     "copy: Declare a target that copies files.";
 const char kCopy_Help[] =
     "copy: Declare a target that copies files.\n"
     "\n"
     "File name handling\n"
     "\n"
@@ skipping 301 matching lines @@
   const Template* templ = scope->GetTemplate(target_type);
   if (templ)
     return templ->Invoke(scope, function, sub_args, block, err);
 
   // Otherwise, assume the target is a built-in target type.
   return ExecuteGenericTarget(target_type.c_str(), scope, function, sub_args,
                               block, err);
 }
 
 }  // namespace functions