IDL: Generate union type containers

Source/bindings/scripts/scripts.gni

 # 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.
 
 import("//third_party/WebKit/Source/bindings/core/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/modules/idl.gni")
 import("//third_party/WebKit/Source/bindings/modules/modules.gni")
 
 bindings_scripts_dir = get_path_info(".", "abspath")
 bindings_scripts_output_dir = "$root_gen_dir/blink/bindings/scripts"
@@ skipping 161 matching lines @@
       # http://crbug.com/358074
       "//third_party/WebKit/Source/bindings/modules:interfaces_info",
 
       "//third_party/WebKit/Source/bindings/scripts:cached_lex_yacc_tables",
       "//third_party/WebKit/Source/bindings/scripts:cached_jinja_templates",
       "//third_party/WebKit/Source/core:generated_testing_idls",
     ]
   }
 }
 
-# Runs the idl_compiler to generate IDL dictionary impl files.
+# Runs the idl_compiler to generate IDL dictionary and union impl files.
 #
 # Parameters:
 #   sources = a list of IDL files to process
 #   outputs = a list of files to write to
-template("idl_dictionary") {
-  output_dir = "$root_gen_dir/blink/"
+#   output_dir = the directory to put the output files
+#   individual_info = a filename of pickle file which contains idl union types
+#   target_component = component to generate code for
+template("idl_impl") {
+  dictionary_impl_output_dir = "$root_gen_dir/blink/"
 
   action(target_name) {
     script = "//third_party/WebKit/Source/bindings/scripts/idl_compiler.py"
     idl_files_list = "$target_gen_dir/${target_name}_file_list.tmp"
     write_file(idl_files_list, rebase_path(invoker.sources, root_build_dir))
 
     inputs = [ idl_files_list ] + invoker.sources
     outputs = invoker.outputs
 
     args = [
       "--cache-dir",
       rebase_path(bindings_scripts_output_dir, root_build_dir),
       "--output-dir",
-      rebase_path(output_dir, root_build_dir),
+      rebase_path(invoker.output_dir, root_build_dir),
+      "--dictionary-impl-output-dir",
+      rebase_path(dictionary_impl_output_dir, root_build_dir),
       "--interfaces-info",
       rebase_path("$bindings_modules_output_dir/InterfacesInfoModules.pickle",
                   root_build_dir),
+      "--individual-info",
+      rebase_path(invoker.individual_info, root_build_dir),
+      "--target-component",
+      invoker.target_component,
       "--write-file-only-if-changed=1",
-      "--generate-dictionary-impl",
+      "--generate-impl",
       rebase_path(idl_files_list, root_build_dir),
     ]
 
     deps = [
       # FIXME: should be interfaces_info_core (w/o modules)
       # http://crbug.com/358074
       "//third_party/WebKit/Source/bindings/modules:interfaces_info",
       "//third_party/WebKit/Source/bindings/scripts:cached_lex_yacc_tables",
       "//third_party/WebKit/Source/bindings/scripts:cached_jinja_templates",
     ]
@@ skipping 113 matching lines @@
       output_header_files += [
         "$output_dir/${interface}${component}Constructors.h"
       ]
     }
 
     outputs = output_idl_files + output_header_files
     deps = invoker.deps
   }
 }