To avoid the requirement of defining unnecessary gyp variables for

remoting/remoting_options.gypi

Index: remoting/remoting_options.gypi
diff --git a/remoting/remoting_options.gypi b/remoting/remoting_options.gypi
index 064a25121e040c218bf85922b059b5248c834047..47193629a3b7b56888ccd04b64e25dc51b75871e 100644
--- a/remoting/remoting_options.gypi
+++ b/remoting/remoting_options.gypi
@@ -27,5 +27,18 @@
     'remoting_rdp_session%': 1,
 
     'branding_path': '../remoting/branding_<(branding)',
+
+    # The ar_service_environment variable is used to define the target
+    # environment for the app being built.
+    # The allowed values are dev, test, staging, and prod.
+    'conditions': [
+      ['buildtype == "Dev"', {
+        'ar_service_environment%': 'dev',
+      }, {  # buildtype != 'Dev'
+        # Non-dev build must have this set to 'prod'.
+        'ar_service_environment': 'prod',
+      }],
+    ],  # conditions
+
   },
 }