Convert gyp targets to use JavaScript

tools/js2c.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python
+
+import contextlib
+import os
+import subprocess
+import sys
+
+
+SOURCE_ROOT = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
+
+
+def main():
+  natives = os.path.abspath(sys.argv[1])
+  js_source_files = sys.argv[2:]
+
+  call_js2c(natives, js_source_files)
+
+
+def call_js2c(natives, js_source_files):
+  js2c = os.path.join(SOURCE_ROOT, 'vendor', 'node', 'tools', 'js2c.py')
+  src_dir = os.path.dirname(js_source_files[0])
+  with scoped_cwd(src_dir):
+    subprocess.check_call(
+        [sys.executable, js2c, natives] +
+        [os.path.basename(source) for source in js_source_files])
+
+
+@contextlib.contextmanager
+def scoped_cwd(path):
+  cwd = os.getcwd()
+  os.chdir(path)
+  try:
+    yield
+  finally:
+    os.chdir(cwd)
+
+
+if __name__ == '__main__':
+  sys.exit(main())