[Android] Enable WebAPK to have multiple intent filters

chrome/android/webapk/shell_apk/manifest_processor.py

 #!/usr/bin/env python
 #
 # Copyright 2017 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.
 
-"""Expands the ShellApk's AndroidManifest.xml using Mustache template engine."""
+"""
+Expands the ShellApk's AndroidManifest.xml using Motemplate template engine.
 
+To convert Motemplate to "Mustache template" replace:

[Yaron, 2017/06/28 18:47:54]

Oh I just saw that explicitly called this out :/

Per offline discussion, wondering if it's easier to just get pystache into
chromium

+1) {{#section:section}} with {{#section}}
+2) {{section.key}} with {{key}}
+"""
+
+import argparse
 import codecs
-import argparse
+import json
 import os
 import sys
 
-# Import motemplate from third_party/motemplate
+#Import motemplate from third_party / motemplate
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir,
                              os.pardir, os.pardir, 'third_party', 'motemplate'))
 import motemplate
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir,
                              os.pardir, os.pardir, 'build', 'android', 'gyp',
                              'util'))
 import build_utils
 
 
-def _ParseVariables(variables_arg, error_func):
-  variables = {}
+def _AppendParsedVariables(initial_variable_list, variables_arg, error_func):
+  variables = initial_variable_list
   for v in build_utils.ParseGnList(variables_arg):
     if '=' not in v:
       error_func('--variables argument must contain "=": ' + v)
     name, _, value = v.partition('=')
     variables[name] = value
   return variables
 
-
-'''
-Rewrite conditional sections to be 'Verted Sections' as defined in handlerbars.
-This allows variables to be used in the AndroidManifest to conditionally define
-include segments.
-'''
-def _RewriteConditionals(template_text):
-  return template_text.replace('{{#', '{{?')
-
-
 def main():
   parser = argparse.ArgumentParser()
   parser.add_argument('--template', required=True,
                       help='The template file to process.')
+  parser.add_argument('--config_file', required=True,
+                      help='JSON file with values to put into template.')
   parser.add_argument('--output', required=True,
                       help='The output file to generate.')
-  parser.add_argument('--variables', help='Variables to be made available in '
-                      'the template processing environment, as a GN list '
-                      '(e.g. --variables "channel=beta mstone=39")', default='')
+  parser.add_argument('--extra_variables', help='Variables to be made '
+                      'available the template processing environment (in '
+                      'addition to those specified in config file), as a GN '
+                      'list (e.g. --extra_variables "channel=beta mstone=39")',
+                      default='')
   options = parser.parse_args()
 
-  variables = _ParseVariables(options.variables, parser.error)
+  variables = {}
+  with open(options.config_file, 'r') as f:
+    variables = json.loads(f.read())
+  variables = _AppendParsedVariables(variables, options.extra_variables,
+                                     parser.error)
+
   with open(options.template, 'r') as f:
-    template = motemplate.Motemplate(_RewriteConditionals(f.read()))
+    template = motemplate.Motemplate(f.read())
     render = template.render(variables)
     with codecs.open(options.output, 'w', 'utf-8') as output_file:
       output_file.write(render.text)
 
 
 if __name__ == '__main__':
   main()