Send isHeadlessBuild flag in error reporting

Summary:
Andrey's diff already ensures that we send the flag, this also adds it to the info string
which makes it more visible.

Reviewed By: lblasa

Differential Revision: D36699070

fbshipit-source-id: 905eded9612b19ecaa35a841ec240af002e11611

desktop/flipper-ui-core/src/utils/info.tsx

@@ -18,6 +18,7 @@ import {getRenderHostInstance} from '../RenderHost';
 type PlatformInfo = {
   arch: string;
   platform: string;
+  isHeadlessBuild: boolean;
   unixname: string;
   versions: {
     [key: string]: string | undefined;
@@ -85,6 +86,7 @@ export function getInfo(): Info {
     platformInfo = {
       arch: envInfo.os.arch,
       platform: envInfo.os.platform,
+      isHeadlessBuild: envInfo.isHeadlessBuild,
       unixname: envInfo.os.unixname,
       versions: envInfo.versions,
     };
@@ -101,7 +103,9 @@ export function getAppVersion(): string {
 
 export function stringifyInfo(info: Info): string {
   const lines = [
-    `Platform: ${info.platform} ${info.arch}`,
+    `Platform: ${info.platform} ${info.arch} (${
+      info.isHeadlessBuild ? 'headless' : 'desktop'
+    })`,
     `Unixname: ${info.unixname}`,
     `Versions:`,
   ];