Add mojo::Binding<Interface> for more flexible pipe<->impl binding

mojo/public/mojo_public.gyp

 # Copyright 2014 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.
 
 {
   'includes': [
     '../mojo_variables.gypi',
   ],
   'targets': [
     {
@@ skipping 52 matching lines @@
     },
     {
       # GN version: //mojo/public/cpp/bindings
       'target_name': 'mojo_cpp_bindings',
       'type': 'static_library',
       'include_dirs': [
         '../..'
       ],
       'sources': [
         'cpp/bindings/array.h',
+        'cpp/bindings/binding.h',
         'cpp/bindings/callback.h',
         'cpp/bindings/error_handler.h',
         'cpp/bindings/interface_impl.h',
         'cpp/bindings/interface_ptr.h',
         'cpp/bindings/interface_request.h',
         'cpp/bindings/message.h',
         'cpp/bindings/message_filter.h',
         'cpp/bindings/no_interface.h',
         'cpp/bindings/string.h',
+        'cpp/bindings/strong_binding.h',
         'cpp/bindings/type_converter.h',
         'cpp/bindings/lib/array_internal.h',
         'cpp/bindings/lib/array_internal.cc',
         'cpp/bindings/lib/array_serialization.h',
         'cpp/bindings/lib/bindings_internal.h',
         'cpp/bindings/lib/bindings_serialization.cc',
         'cpp/bindings/lib/bindings_serialization.h',
         'cpp/bindings/lib/bounds_checker.cc',
         'cpp/bindings/lib/bounds_checker.h',
         'cpp/bindings/lib/buffer.h',
         'cpp/bindings/lib/callback_internal.h',
         'cpp/bindings/lib/connector.cc',
         'cpp/bindings/lib/connector.h',
         'cpp/bindings/lib/filter_chain.cc',
         'cpp/bindings/lib/filter_chain.h',
         'cpp/bindings/lib/fixed_buffer.cc',
         'cpp/bindings/lib/fixed_buffer.h',
-        'cpp/bindings/lib/interface_impl_internal.h',
         'cpp/bindings/lib/interface_ptr_internal.h',
         'cpp/bindings/lib/map_data_internal.h',
         'cpp/bindings/lib/map_internal.h',
         'cpp/bindings/lib/map_serialization.h',
         'cpp/bindings/lib/message.cc',
         'cpp/bindings/lib/message_builder.cc',
         'cpp/bindings/lib/message_builder.h',
         'cpp/bindings/lib/message_filter.cc',
         'cpp/bindings/lib/message_header_validator.cc',
         'cpp/bindings/lib/message_header_validator.h',
@@ skipping 250 matching lines @@
            },
            'dependencies': [
              'mojo_public_java',
            ],
            'includes': [ '../../build/java.gypi' ],
         },
       ],
     }],
   ],
 }