Set the chromium_code GYP variable

tools/tools.gyp

 # Copyright 2014 The Crashpad Authors. All rights reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
 # You may obtain a copy of the License at
 #
 #     http://www.apache.org/licenses/LICENSE-2.0
 #
 # Unless required by applicable law or agreed to in writing, software
 # distributed under the License is distributed on an "AS IS" BASIS,
 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
 {
+  'includes': [
+    '../build/crashpad.gypi',
+  ],
   'conditions': [
     ['OS=="mac"', {
       'variables': {
         # Programs that use task_for_pid() can indicate to taskgated(8) in their
         # Info.plist that they are allowed to call that function. In order for
         # this to work, the programs in question must be signed by an authority
         # trusted by the system. Signing is beyond the scope of the build, but
         # the key to make this work is placed in Info.plist to enable the
         # desired behavior once the tools that require this access are signed.
         #
@@ skipping 134 matching lines @@
           'sources': [
             'mac/run_with_crashpad.cc',
           ],
         },
       ],
     }, {
       'targets': [],
     }],
   ],
 }