[iOS/GN] Replace the last to gyp-mac-tool commands with standalone scripts.

build/config/ios/write_framework_modulemap.py

Index: build/config/ios/write_framework_modulemap.py
diff --git a/build/config/ios/write_framework_modulemap.py b/build/config/ios/write_framework_modulemap.py
new file mode 100644
index 0000000000000000000000000000000000000000..b6da571282de3853671347b5e3769cf97f4c8cc3
--- /dev/null
+++ b/build/config/ios/write_framework_modulemap.py
@@ -0,0 +1,26 @@
+# 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 os
+import sys
+
+def Main(framework):
+  # Find the name of the binary based on the part before the ".framework".
+  binary = os.path.basename(framework).split('.')[0]
+  module_path = os.path.join(framework, 'Modules');
+  if not os.path.exists(module_path):
+    os.mkdir(module_path)
+  module_template = 'framework module %s {\n' \
+                    '  umbrella header "%s.h"\n' \
+                    '\n' \
+                    '  export *\n' \
+                    '  module * { export * }\n' \
+                    '}\n' % (binary, binary)
+
+  module_file = open(os.path.join(module_path, 'module.modulemap'), 'w')
+  module_file.write(module_template)
+  module_file.close()
+
+if __name__ == '__main__':
+  Main(sys.argv[1])