[Editor] Change the enableML pref for enableAltText (bug 1905923)

We want to use this pref to make a Nimbus experiment in the next weeks.

web/app.js

@@ -752,10 +752,11 @@ const PDFViewerApplication = {
   },
 
   get mlManager() {
+    const enableAltText = AppOptions.get("enableAltText");
     return shadow(
       this,
       "mlManager",
-      AppOptions.get("enableML") === true ? new MLManager() : null
+      enableAltText === true ? new MLManager({ enableAltText }) : null
     );
   },
 

web/app_options.js

@@ -136,6 +136,11 @@ const defaultOptions = {
     value: false,
     kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
   },
+  enableAltText: {
+    /** @type {boolean} */
+    value: false,
+    kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
+  },
   enableHighlightEditor: {
     // We'll probably want to make some experiments before enabling this
     // in Firefox release, but it has to be temporary.
@@ -152,11 +157,6 @@ const defaultOptions = {
     value: typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING"),
     kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
   },
-  enableML: {
-    /** @type {boolean} */
-    value: false,
-    kind: OptionKind.VIEWER + OptionKind.PREFERENCE,
-  },
   enablePermissions: {
     /** @type {boolean} */
     value: false,

web/chromecom.js

@@ -436,6 +436,10 @@ class ExternalServices extends BaseExternalServices {
 }
 
 class MLManager {
+  isEnabledFor(_name) {
+    return false;
+  }
+
   async guess() {
     return null;
   }

web/firefoxcom.js

@@ -303,6 +303,16 @@ class FirefoxScripting {
 }
 
 class MLManager {
+  #enabled = new Map();
+
+  constructor({ enableAltText }) {
+    this.#enabled.set("altText", enableAltText);
+  }
+
+  isEnabledFor(name) {
+    return this.#enabled.get(name);
+  }
+
   guess(data) {
     return FirefoxCom.requestAsync("mlGuess", data);
   }

web/genericcom.js

@@ -48,6 +48,10 @@ class ExternalServices extends BaseExternalServices {
 }
 
 class MLManager {
+  isEnabledFor(_name) {
+    return false;
+  }
+
   async guess() {
     return null;
   }