Add proto definitions for messages used by CryptAuth APIs and the authentication protocol.

components/proximity_auth.gypi

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'proximity_auth',
       'type': 'static_library',
       'include_dirs': [
@@ skipping 14 matching lines @@
         "proximity_auth/connection.h",
         "proximity_auth/connection_observer.h",
         "proximity_auth/proximity_auth_system.cc",
         "proximity_auth/proximity_auth_system.h",
         "proximity_auth/remote_device.h",
         "proximity_auth/wire_message.cc",
         "proximity_auth/wire_message.h",
       ],
     },
     {
+      # GN version: //components/cryptauth/proto
+      'target_name': 'cryptauth_proto',
+      'type': 'static_library',
+      'sources': [
+        'proximity_auth/cryptauth/proto/cryptauth_api.proto',
+      ],
+      'variables': {
+        'proto_in_dir': 'proximity_auth/cryptauth/proto',
+        'proto_out_dir': 'components/proximity_auth/cryptauth/proto',
+      },
+      'includes': [ '../build/protoc.gypi' ]
+    },
+    {
       'target_name': 'cryptauth',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../google_apis/google_apis.gyp:google_apis',
         '../net/net.gyp:net',
       ],
       'sources': [
         "proximity_auth/cryptauth/cryptauth_api_call_flow.cc",
         "proximity_auth/cryptauth/cryptauth_api_call_flow.h",
       ],
     },
   ],
 }