include.gypi variables to specify API keys or use internal header for keys.

google_apis/google_apis.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,  # Use higher warning level.
   },
   'includes': [
     '../build/win_precompile.gypi',
   ],
   'targets': [
     {
       'target_name': 'google_apis',
       'type': 'static_library',
       'dependencies': [
         '../base/base.gyp:base',
         '../crypto/crypto.gyp:crypto',
         '../net/net.gyp:net',
       ],
+      'conditions': [
+        ['google_api_key!=""', {
+          'defines': ['GOOGLE_API_KEY="<(google_api_key)"'],
+        }],
+        # Once the default definitions for the various keys in
+        # google_apis/google_api_keys.cc are all made empty, the next
+        # two conditionals can set just GOOGLE_DEFAULT_CLIENT_ID/SECRET.
+        # Until then, we have different semantics on the gyp variables
+        # google_default_client_id/secret and setting the environment
+        # variables of the (upper-case) same name (the latter are used
+        # as the default for unset client IDs/secrets, whereas the
+        # former overrides all client IDs/secrets).
+        # TODO(joi): Fix the above semantic mismatch once possible.
+        ['google_default_client_id!=""', {
+          'defines': [
+            'GOOGLE_CLIENT_ID_MAIN="<(google_default_client_id)"',
+            'GOOGLE_CLIENT_ID_CLOUD_PRINT="<(google_default_client_id)"',
+            'GOOGLE_CLIENT_ID_REMOTING="<(google_default_client_id)"',
+          ]
+        }],
+        ['google_default_client_secret!=""', {
+          'defines': [
+            'GOOGLE_CLIENT_SECRET_MAIN="<(google_default_client_secret)"',
+            'GOOGLE_CLIENT_SECRET_CLOUD_PRINT="<(google_default_client_secret)"',
+            'GOOGLE_CLIENT_SECRET_REMOTING="<(google_default_client_secret)"',
+          ]
+        }],
+        ['use_official_google_api_keys==1', {
+          'defines': ['USE_OFFICIAL_GOOGLE_API_KEYS=1'],
+        }],
+      ],
       'sources': [
         'gaia/gaia_auth_consumer.cc',
         'gaia/gaia_auth_consumer.h',
         'gaia/gaia_auth_fetcher.cc',
         'gaia/gaia_auth_fetcher.h',
         'gaia/gaia_auth_util.cc',
         'gaia/gaia_auth_util.h',
         'gaia/gaia_authenticator.cc',
         'gaia/gaia_authenticator.h',
         'gaia/gaia_constants.cc',
@@ skipping 43 matching lines @@
         'gaia/oauth_request_signer_unittest.cc',
         'gaia/oauth2_access_token_fetcher_unittest.cc',
         'gaia/oauth2_api_call_flow_unittest.cc',
         'gaia/oauth2_mint_token_fetcher_unittest.cc',
         'gaia/oauth2_mint_token_flow_unittest.cc',
         'gaia/oauth2_revocation_fetcher_unittest.cc',
       ],
     },
   ],
 }