Avoid string allocation when parsing CSSPrimitiveValue::UnitType

third_party/WebKit/Source/build/scripts/make_css_primitive_value_unit_trie.py

Index: third_party/WebKit/Source/build/scripts/make_css_primitive_value_unit_trie.py
diff --git a/third_party/WebKit/Source/build/scripts/make_css_primitive_value_unit_trie.py b/third_party/WebKit/Source/build/scripts/make_css_primitive_value_unit_trie.py
new file mode 100755
index 0000000000000000000000000000000000000000..bd07ff1958f4f97b6d39b8477270a1cb49c8045a
--- /dev/null
+++ b/third_party/WebKit/Source/build/scripts/make_css_primitive_value_unit_trie.py
@@ -0,0 +1,35 @@
+#!/usr/bin/env python
+# Copyright 2016 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 sys
+
+import in_generator
+import trie_builder
+import template_expander
+
+
+class UnitTrieWriter(in_generator.Writer):
+    defaults = {
+        'unit_type': None
+    }
+
+    def __init__(self, in_file_paths):
+        super(UnitTrieWriter, self).__init__(in_file_paths)
+
+        self._units = {entry['name']: entry['unit_type'] for entry in self.in_file.name_dictionaries}
+
+        self._outputs = {
+            'CSSPrimitiveValueUnitTrie.cpp': self.generate_implementation
+        }
+
+    @template_expander.use_jinja('CSSPrimitiveValueUnitTrie.cpp.tmpl')
+    def generate_implementation(self):
+        return {
+            'length_tries': trie_builder.trie_list_by_str_length(self._units)
+        }
+
+
+if __name__ == '__main__':
+    in_generator.Maker(UnitTrieWriter).main(sys.argv)