Introduce CryptAuthGCMManager, which handles GCM interactions for CryptAuth.

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': [
     {
       # GN version: //components/proximity_auth and
       # //components/proximity_auth/ble.
       'target_name': 'proximity_auth',
@@ skipping 101 matching lines @@
     {
       'target_name': 'cryptauth',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         'cryptauth_proto',
         '../base/base.gyp:base',
         '../crypto/crypto.gyp:crypto',
+        '../components/components.gyp:gcm_driver',
         '../google_apis/google_apis.gyp:google_apis',
         '../net/net.gyp:net',
       ],
       'sources': [
         "proximity_auth/cryptauth/base64url.cc",
         "proximity_auth/cryptauth/base64url.h",
         "proximity_auth/cryptauth/cryptauth_access_token_fetcher.h",
         "proximity_auth/cryptauth/cryptauth_access_token_fetcher_impl.cc",
         "proximity_auth/cryptauth/cryptauth_access_token_fetcher_impl.h",
         "proximity_auth/cryptauth/cryptauth_api_call_flow.cc",
         "proximity_auth/cryptauth/cryptauth_api_call_flow.h",
         "proximity_auth/cryptauth/cryptauth_client.h",
         "proximity_auth/cryptauth/cryptauth_client_impl.cc",
         "proximity_auth/cryptauth/cryptauth_client_impl.h",
         "proximity_auth/cryptauth/cryptauth_device_manager.cc",
         "proximity_auth/cryptauth/cryptauth_device_manager.h",
         "proximity_auth/cryptauth/cryptauth_enroller.h",
         "proximity_auth/cryptauth/cryptauth_enroller_impl.cc",
         "proximity_auth/cryptauth/cryptauth_enroller_impl.h",
         "proximity_auth/cryptauth/cryptauth_enrollment_manager.cc",
         "proximity_auth/cryptauth/cryptauth_enrollment_manager.h",
         "proximity_auth/cryptauth/cryptauth_enrollment_utils.cc",
+        "proximity_auth/cryptauth/cryptauth_gcm_manager.cc",
+        "proximity_auth/cryptauth/cryptauth_gcm_manager.h",
+        "proximity_auth/cryptauth/cryptauth_gcm_manager_impl.cc",
+        "proximity_auth/cryptauth/cryptauth_gcm_manager_impl.h",
         "proximity_auth/cryptauth/pref_names.cc",
         "proximity_auth/cryptauth/pref_names.h",
         "proximity_auth/cryptauth/secure_message_delegate.cc",
         "proximity_auth/cryptauth/secure_message_delegate.h",
         "proximity_auth/cryptauth/sync_scheduler.cc",
         "proximity_auth/cryptauth/sync_scheduler.h",
         "proximity_auth/cryptauth/sync_scheduler_impl.cc",
         "proximity_auth/cryptauth/sync_scheduler_impl.h",
       ],
       'export_dependent_settings': [
@@ skipping 45 matching lines @@
         'proximity_auth/webui/proximity_auth_ui.h',
         'proximity_auth/webui/proximity_auth_ui_delegate.h',
         'proximity_auth/webui/proximity_auth_webui_handler.cc',
         'proximity_auth/webui/proximity_auth_webui_handler.h',
         'proximity_auth/webui/url_constants.cc',
         'proximity_auth/webui/url_constants.h',
       ],
     },
   ],
 }