Adds plumbing to pass WebUI mojo::Handle from browser to renderer

mojo/public/bindings/mojom_bindings_generator.gypi

 # Copyright 2013 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.
 
 {
   'rules': [
     {
       'rule_name': 'Generate C++ source files from mojom files',
       'extension': 'mojom',
       'variables': {
-        'mojom_base_output_dir':
-            '<!(python <(DEPTH)/build/inverse_depth.py <(DEPTH))',
+        # TODO(sky): uncomment this once gyp bug fixed and remove explicit
+        # setting everywhere
+        # 'mojom_base_output_dir':
+        #      '<!(python <(DEPTH)/build/inverse_depth.py <(DEPTH))',
         'mojom_bindings_generator':
             '<(DEPTH)/mojo/public/bindings/mojom_bindings_generator.py',
       },
       'inputs': [
         '<(mojom_bindings_generator)',
         '<(DEPTH)/mojo/public/bindings/generators/cpp_templates/enum_declaration.tmpl',
         '<(DEPTH)/mojo/public/bindings/generators/cpp_templates/interface_declaration.tmpl',
         '<(DEPTH)/mojo/public/bindings/generators/cpp_templates/interface_definition.tmpl',
         '<(DEPTH)/mojo/public/bindings/generators/cpp_templates/interface_macros.tmpl',
         '<(DEPTH)/mojo/public/bindings/generators/cpp_templates/interface_proxy_declaration.tmpl',
@@ skipping 46 matching lines @@
     '<(SHARED_INTERMEDIATE_DIR)',
   ],
   'direct_dependent_settings': {
     'include_dirs': [
       '<(DEPTH)',
       '<(SHARED_INTERMEDIATE_DIR)',
     ],
   },
   'hard_dependency': 1,
 }