Bug 1335829 Add mozAddonManager.permissionPromptsEnabled r=qdot

MozReview-Commit-ID: FldFilY24kf

--HG--
extra : rebase_source : 19a8996a443098fbe095cd14653d10dc80f30b68

dom/webidl/AddonManager.webidl

@@ -77,6 +77,9 @@ interface AddonManager : EventTarget {
    */
   Promise<AddonInstall> createInstall(optional addonInstallOptions options);
 
+  // Indicator to content whether permissions prompts are enabled
+  readonly attribute boolean permissionPromptsEnabled;
+
   /* Hooks for managing event listeners */
   [ChromeOnly]
   void eventListenerWasAdded(DOMString type);

toolkit/mozapps/extensions/amWebAPI.js

@@ -10,6 +10,9 @@ Cu.import("resource://gre/modules/XPCOMUtils.jsm");
 Cu.import("resource://gre/modules/Services.jsm");
 Cu.import("resource://gre/modules/Task.jsm");
 
+XPCOMUtils.defineLazyPreferenceGetter(this, "WEBEXT_PERMISSION_PROMPTS",
+                                      "extensions.webextPermissionPrompts", false);
+
 const MSG_PROMISE_REQUEST  = "WebAPIPromiseRequest";
 const MSG_PROMISE_RESULT   = "WebAPIPromiseResult";
 const MSG_INSTALL_EVENT    = "WebAPIInstallEvent";
@@ -239,6 +242,10 @@ class WebAPI extends APIObject {
     });
   }
 
+  get permissionPromptsEnabled() {
+    return WEBEXT_PERMISSION_PROMPTS;
+  }
+
   eventListenerWasAdded(type) {
     if (this.listenerCount == 0) {
       this.broker.setAddonListener(data => {

toolkit/mozapps/extensions/test/browser/browser_webapi.js

@@ -104,3 +104,19 @@ add_task(testWithAPI(function*(browser) {
   compareObjects(w2, a2);
   compareObjects(w3, a3);
 }));
+
+add_task(testWithAPI(function*(browser) {
+  function* check(value, message) {
+    let enabled = yield ContentTask.spawn(browser, null, function*() {
+      return content.navigator.mozAddonManager.permissionPromptsEnabled;
+    });
+    is(enabled, value, message);
+  }
+
+  const PERM = "extensions.webextPermissionPrompts";
+  yield SpecialPowers.pushPrefEnv({clear: [[PERM]]});
+  yield check(false, `mozAddonManager.permissionPromptsEnabled is false when ${PERM} is unset`);
+
+  yield SpecialPowers.pushPrefEnv({set: [[PERM, true]]});
+  yield check(true, `mozAddonManager.permissionPromptsEnabled is true when ${PERM} is set`);
+}));