Factor and simplify generation of the lookup trie used for HTMLLookupTrie.

third_party/WebKit/Source/build/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/config.gni")
 
 # All paths in this file should be absolute so targets in any directory can use
 # them without worrying about the current directory.
 _scripts_dir = "//third_party/WebKit/Source/build/scripts"
 
@@ skipping 38 matching lines @@
       "$_scripts_dir/templates/ElementFactory.cpp.tmpl",
       "$_scripts_dir/templates/ElementFactory.h.tmpl",
     ]
 
 make_element_type_helpers_files =
     make_qualified_names_files + [
       "$_scripts_dir/make_element_type_helpers.py",
       "$_scripts_dir/templates/ElementTypeHelpers.h.tmpl",
     ]
 
+make_trie_helpers_files =
+    scripts_for_in_files + [ "$_scripts_dir/trie_builder.py" ]
+
 # The executables are relative to the build directory. Don't rebase it because
 # on Posix we want to run the system one on the path.
 if (host_os == "win") {
   gperf_exe = rebase_path("//third_party/gperf/bin/gperf.exe", root_build_dir)
   bison_exe = rebase_path("//third_party/bison/bin/bison.exe", root_build_dir)
 } else {
   gperf_exe = "gperf"
   bison_exe = "bison"
 }
 
@@ skipping 132 matching lines @@
     ]
 
     args = [
       rebase_path(invoker.input_file, root_build_dir),
       rebase_path(invoker.output_file, root_build_dir),
     ]
 
     deps = make_core_generated_deps
   }
 }