Add some missing dependencies

actionpack/lib/action_controller/testing/process.rb

+require 'action_dispatch'
 require 'rack/session/abstract/id'
 require 'active_support/core_ext/object/conversions'
 

actionpack/lib/action_view.rb

@@ -36,6 +36,7 @@ def self.load_all!
   autoload :Base,              'action_view/base'
   autoload :Helpers,           'action_view/helpers'
   autoload :InlineTemplate,    'action_view/template/inline'
+  autoload :MissingTemplate,   'action_view/base'
   autoload :Partials,          'action_view/render/partials'
   autoload :Resolver,          'action_view/template/resolver'
   autoload :PathSet,           'action_view/paths'

activemodel/lib/active_model/validations.rb

 require 'active_support/core_ext/array/extract_options'
 require 'active_support/core_ext/hash/keys'
+require 'active_support/concern'
+require 'active_support/callbacks'
 
 module ActiveModel
   module Validations