Bug 1497470 - Correctly type Targets.listWorkers request. r=yulia

MozReview-Commit-ID: BfjRhhIDxiF

Depends on D10189

Differential Revision: https://phabricator.services.mozilla.com/D10387

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

devtools/shared/specs/targets/browsing-context.js

@@ -37,6 +37,7 @@ types.addDictType("browsingContextTarget.window", {
 
 types.addDictType("browsingContextTarget.workers", {
   error: "nullable:string",
+  workers: "nullable:array:json",
 });
 
 types.addDictType("browsingContextTarget.reload", {

devtools/shared/specs/targets/content-process.js

@@ -7,6 +7,7 @@ const {types, Option, RetVal, generateActorSpec} = require("devtools/shared/prot
 
 types.addDictType("contentProcessTarget.workers", {
   error: "nullable:string",
+  workers: "nullable:array:json",
 });
 
 const contentProcessTargetSpec = generateActorSpec({