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diff --git a/libchrome_tools/mojom_generate_type_mappings.py b/libchrome_tools/mojom_generate_type_mappings.py
new file mode 100644
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+++ b/libchrome_tools/mojom_generate_type_mappings.py
@@ -0,0 +1,93 @@
+#!/usr/bin/python
+
+# Copyright (C) 2018 The Android Open Source Project
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Drives mojom typemapping generator.
+
+Usage:
+
+% python libchrome_tools/mojom_generate_type_mappings.py \
+      --output ${output_type_mapping_file_path} \
+      ${list of .typemap files}
+"""
+
+import argparse
+import os
+import subprocess
+import sys
+
+from build import gn_helpers
+
+_GENERATE_TYPE_MAPPINGS_PATH = os.path.join(
+    os.path.dirname(__file__),
+    '../mojo/public/tools/bindings/generate_type_mappings.py')
+
+def _read_typemap_config(path):
+  """Reads .typemap file.
+
+  Args:
+    path: File path to the .typemap location.
+
+  Returns:
+    A dictionary holding values in .typemap file.
+  """
+
+  with open(path) as f:
+    # gn_helpers does not handle comment lines.
+    content = [line for line in f if not line.strip().startswith('#')]
+  return gn_helpers.FromGNArgs(''.join(content))
+
+
+def _generate_type_mappings(input_paths, output):
+  """Generates __type_mappings file from given .typemap files.
+
+  Builds a command line to run generate_type_mappings.py, and executes it.
+
+  Args:
+    input_paths: a list of file paths for .typemap files.
+    output: a path to output __type_mappings file.
+  """
+  command = [sys.executable, _GENERATE_TYPE_MAPPINGS_PATH, '--output', output]
+
+  # TODO(hidehiko): Add dependency handling.
+
+  for path in input_paths:
+    typemap_config = _read_typemap_config(path)
+    command.append('--start-typemap')
+    for public_header in typemap_config.get('public_headers', []):
+      command.append('public_headers=' + public_header)
+    for traits_header in typemap_config.get('traits_headers', []):
+      command.append('traits_headers=' + traits_header)
+    for type_mapping in typemap_config.get('type_mappings', []):
+      command.append('type_mappings=' + type_mapping)
+
+  subprocess.check_call(command)
+
+
+def _parse_args():
+  parser = argparse.ArgumentParser()
+  parser.add_argument('--output', help='Output file path')
+  parser.add_argument('input_paths', metavar="INPUT-PATH", nargs='+',
+                      help='Input typemap files.')
+  return parser.parse_args()
+
+
+def main():
+  args = _parse_args()
+  _generate_type_mappings(args.input_paths, args.output)
+
+
+if __name__ == '__main__':
+  main()