Add "envoy" GYP variable for pulling in envoy targets.

build/all.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': {
     # A hook that can be overridden in other repositories to add additional
     # compilation targets to 'All'. Only used on Android.
     'android_app_targets%': [],
   },
@@ skipping 258 matching lines @@
         ['chromeos==1 or OS=="linux" or OS=="win"', {
           'dependencies': [
             '../extensions/shell/app_shell.gyp:*',
           ],
         }],
         ['chromeos==1', {
           'dependencies': [
             '../athena/main/athena_main.gyp:*',
           ],
         }],
+        ['envoy==1', {
+          'dependencies': [
+            '../envoy/envoy.gyp:*',
+          ],
+        }],
       ],
     }, # target_name: All
     {
       'target_name': 'All_syzygy',
       'type': 'none',
       'conditions': [
         ['OS=="win" and fastbuild==0 and target_arch=="ia32" and '
             '(syzyasan==1 or syzygy_optimize==1)', {
           'dependencies': [
             '../chrome/installer/mini_installer_syzygy.gyp:*',
@@ skipping 1073 matching lines @@
           'dependencies': [
             '../ui/views/examples/examples.gyp:views_examples_with_content_exe',
             '../ui/views/views.gyp:views',
             '../ui/views/views.gyp:views_unittests',
           ],
         },  # target_name: macviews_builder
       ],  # targets
     }],  # os=='mac' and toolkit_views==1
   ],  # conditions
 }