Bug 1560278 - Prepend "Headless" in Browser.getVersion's product field when firefox runs headless. r=remote-protocol-reviewers,ato

Differential Revision: https://phabricator.services.mozilla.com/D35416

--HG--
extra : moz-landing-system : lando

remote/domains/parent/Browser.jsm

@@ -11,9 +11,10 @@ const {Domain} = ChromeUtils.import("chrome://remote/content/domains/Domain.jsm"
 
 class Browser extends Domain {
   getVersion() {
+    const { isHeadless } = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo);
     return {
       protocolVersion: "1",
-      product: "Firefox",
+      product: (isHeadless ? "Headless " : "") + "Firefox",
       revision: "1",
       userAgent: "Firefox",
       jsVersion: "1.8.5",

remote/test/browser/browser_cdp.js

@@ -34,7 +34,8 @@ add_task(async function testCDP() {
   ok("Page" in client, "Page domain is available");
 
   const version = await Browser.getVersion();
-  is(version.product, "Firefox", "Browser.getVersion works");
+  const { isHeadless } = Cc["@mozilla.org/gfx/info;1"].getService(Ci.nsIGfxInfo);
+  is(version.product, isHeadless ? "Headless Firefox" : "Firefox", "Browser.getVersion works and depends on headless mode");
 
   // receive console.log messages and print them
   Log.enable();