From 620bbb27eaca8ce70d402c296dd1e424bf23b561 Mon Sep 17 00:00:00 2001
From: Andreas Farre <farre@mozilla.com>
Date: Fri, 27 Jan 2023 09:17:17 +0000
Subject: [PATCH] Bug 1806501 - Start the JS Oracle process early. r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D167230
---
 browser/components/BrowserGlue.sys.mjs | 8 ++++++++
 dom/base/ChromeUtils.cpp               | 7 +++++++
 dom/base/ChromeUtils.h                 | 2 ++
 dom/chrome-webidl/ChromeUtils.webidl   | 5 +++++
 4 files changed, 22 insertions(+)

diff --git a/browser/components/BrowserGlue.sys.mjs b/browser/components/BrowserGlue.sys.mjs
index 5c0e8b421d58..8af42d330f1a 100644
--- a/browser/components/BrowserGlue.sys.mjs
+++ b/browser/components/BrowserGlue.sys.mjs
@@ -2855,6 +2855,14 @@ BrowserGlue.prototype = {
         },
       },
 
+      {
+        // Starts the JSOracle process for ORB JavaScript validation, if it hasn't started already.
+        name: "start-orb-javascript-oracle",
+        task: () => {
+          ChromeUtils.ensureJSOracleStarted();
+        },
+      },
+
       {
         name: "browser-startup-idle-tasks-finished",
         task: () => {
diff --git a/dom/base/ChromeUtils.cpp b/dom/base/ChromeUtils.cpp
index fffabcf6aa5d..7a0828a9b102 100644
--- a/dom/base/ChromeUtils.cpp
+++ b/dom/base/ChromeUtils.cpp
@@ -6,6 +6,7 @@
 
 #include "ChromeUtils.h"
 
+#include "JSOracleParent.h"
 #include "js/CharacterEncoding.h"
 #include "js/Object.h"              // JS::GetClass
 #include "js/PropertyAndElement.h"  // JS_DefineProperty, JS_DefinePropertyById, JS_Enumerate, JS_GetProperty, JS_GetPropertyById, JS_SetProperty, JS_SetPropertyById, JS::IdVector
@@ -1762,6 +1763,12 @@ bool ChromeUtils::IsDarkBackground(GlobalObject&, Element& aElement) {
 
 double ChromeUtils::DateNow(GlobalObject&) { return JS_Now() / 1000.0; }
 
+/* static */
+void ChromeUtils::EnsureJSOracleStarted(GlobalObject&) {
+  JSOracleParent::WithJSOracle(
+      [](JSOracleParent* aParent) { MOZ_DIAGNOSTIC_ASSERT(aParent); });
+}
+
 /* static */
 unsigned ChromeUtils::AliveUtilityProcesses(const GlobalObject&) {
   const auto& utilityProcessManager =
diff --git a/dom/base/ChromeUtils.h b/dom/base/ChromeUtils.h
index cd30c0e8ca77..9b570d9d92b4 100644
--- a/dom/base/ChromeUtils.h
+++ b/dom/base/ChromeUtils.h
@@ -285,6 +285,8 @@ class ChromeUtils {
 
   static double DateNow(GlobalObject&);
 
+  static void EnsureJSOracleStarted(GlobalObject&);
+
   static unsigned AliveUtilityProcesses(const GlobalObject&);
 };
 
diff --git a/dom/chrome-webidl/ChromeUtils.webidl b/dom/chrome-webidl/ChromeUtils.webidl
index 109d61bb5673..564a2d069c0c 100644
--- a/dom/chrome-webidl/ChromeUtils.webidl
+++ b/dom/chrome-webidl/ChromeUtils.webidl
@@ -654,6 +654,11 @@ partial namespace ChromeUtils {
    */
   boolean isDarkBackground(Element element);
 
+  /**
+   * Starts the JSOracle process for ORB JavaScript validation, if it hasn't started already.
+   */
+  undefined ensureJSOracleStarted();
+
   /**
    * The number of currently alive utility processes.
    */