Separate out experimental and production remote config for permessageDeflate

Author: andrew-signal

ts/RemoteConfig.ts

@@ -38,6 +38,7 @@ const KnownConfigKeys = [
   'desktop.libsignalNet.shadowUnauthChatWithNoise',
   'desktop.libsignalNet.shadowAuthChatWithNoise',
   'desktop.libsignalNet.chatPermessageDeflate',
+  'desktop.libsignalNet.chatPermessageDeflate.prod',
   'desktop.funPicker', // alpha
   'desktop.funPicker.beta',
   'desktop.funPicker.prod',

ts/textsecure/WebAPI.ts

@@ -2054,11 +2054,10 @@ export function initialize({
       log.info('libsignal net will shadow auth chat connections');
       libsignalRemoteConfig.set('shadowAuthChatWithNoise', 'true');
     }
-    if (
-      window.Signal.RemoteConfig.isEnabled(
-        'desktop.libsignalNet.chatPermessageDeflate'
-      )
-    ) {
+    const perMessageDeflateConfigKey = isProduction(version)
+      ? 'desktop.libsignalNet.chatPermessageDeflate.prod'
+      : 'desktop.libsignalNet.chatPermessageDeflate';
+    if (window.Signal.RemoteConfig.isEnabled(perMessageDeflateConfigKey)) {
       libsignalRemoteConfig.set('chatPermessageDeflate', 'true');
     }
     libsignalNet.setRemoteConfig(libsignalRemoteConfig);