Bug 1721123 - Expose AbortController in Sandbox. r=smaug.

AbortController can be used to remove multiple event listeners
in a single call, and that's a pattern the DevTools team want to
start using.
As some of DevTools code run in a Sandbox, we couldn't instantiate
AbortController there so far.
This patch exposes the AbortController in the Sandbox so instances
can be created.

Differential Revision: https://phabricator.services.mozilla.com/D120193

js/xpconnect/src/Sandbox.cpp

@@ -35,6 +35,7 @@
 #include "xpc_make_class.h"
 #include "XPCWrapper.h"
 #include "Crypto.h"
+#include "mozilla/dom/AbortControllerBinding.h"
 #include "mozilla/dom/AutoEntryScript.h"
 #include "mozilla/dom/BindingCallContext.h"
 #include "mozilla/dom/BindingUtils.h"
@@ -844,7 +845,10 @@ bool xpc::GlobalProperties::Parse(JSContext* cx, JS::HandleObject obj) {
     if (!nameStr) {
       return false;
     }
-    if (JS_LinearStringEqualsLiteral(nameStr, "Blob")) {
+
+    if (JS_LinearStringEqualsLiteral(nameStr, "AbortController")) {
+      AbortController = true;
+    } else if (JS_LinearStringEqualsLiteral(nameStr, "Blob")) {
       Blob = true;
     } else if (JS_LinearStringEqualsLiteral(nameStr, "ChromeUtils")) {
       ChromeUtils = true;
@@ -947,6 +951,11 @@ bool xpc::GlobalProperties::Define(JSContext* cx, JS::HandleObject obj) {
   // This function holds common properties not exposed automatically but able
   // to be requested either in |Cu.importGlobalProperties| or
   // |wantGlobalProperties| of a sandbox.
+  if (AbortController &&
+      !dom::AbortController_Binding::GetConstructorObject(cx)) {
+    return false;
+  }
+
   if (Blob && !dom::Blob_Binding::GetConstructorObject(cx)) return false;
 
   if (ChromeUtils && !dom::ChromeUtils_Binding::GetConstructorObject(cx)) {

js/xpconnect/src/xpcprivate.h

@@ -2215,6 +2215,7 @@ struct GlobalProperties {
   bool DefineInSandbox(JSContext* cx, JS::HandleObject obj);
 
   // Interface objects we can expose.
+  bool AbortController : 1;
   bool Blob : 1;
   bool ChromeUtils : 1;
   bool CSS : 1;