Bug 1602692: Enable a11y tests for Fission which depend on TakeFocus. r=yzen

nsFocusManager::SetFocus (and thus Accessible::TakeFocus) was fixed for Fission in bug 1556627.
Most of these tests now pass without modification.
browser_caching_value.js needed to be tweaked slightly to synthesize a key in the OOP iframe instead of the top level document.

Differential Revision: https://phabricator.services.mozilla.com/D64254

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

accessible/tests/browser/e10s/browser.ini

@@ -15,20 +15,17 @@ support-files =
 
 # Caching tests
 [browser_caching_attributes.js]
-skip-if = fission # Bug 1556627
 [browser_caching_description.js]
 [browser_caching_name.js]
 skip-if = (os == "linux" && bits == 64) || (debug && os == "mac") || (debug && os == "win") #Bug 1388256
 [browser_caching_relations.js]
 [browser_caching_states.js]
 [browser_caching_value.js]
-skip-if = fission # Bug 1556627
 
 # Events tests
 [browser_events_announcement.js]
 skip-if = e10s && os == 'win' # Bug 1288839
 [browser_events_caretmove.js]
-skip-if = fission # Bug 1556627
 [browser_events_hide.js]
 [browser_events_show.js]
 [browser_events_statechange.js]
@@ -52,7 +49,6 @@ skip-if = e10s && os == 'win' # Bug 1288839
 [browser_treeupdate_optgroup.js]
 [browser_treeupdate_removal.js]
 [browser_treeupdate_select_dropdown.js]
-skip-if = fission # Bug 1556627
 [browser_treeupdate_table.js]
 [browser_treeupdate_textleaf.js]
 [browser_treeupdate_visibility.js]

accessible/tests/browser/e10s/browser_caching_value.js

@@ -136,7 +136,13 @@ const valueTests = [
     id: "range",
     async action(browser) {
       await invokeFocus(browser, "range");
-      await BrowserTestUtils.synthesizeKey("VK_LEFT", {}, browser);
+      await invokeContentTask(browser, [], () => {
+        const { ContentTaskUtils } = ChromeUtils.import(
+          "resource://testing-common/ContentTaskUtils.jsm"
+        );
+        const EventUtils = ContentTaskUtils.getEventUtils(content);
+        EventUtils.synthesizeKey("VK_LEFT", {}, content);
+      });
     },
     waitFor: EVENT_VALUE_CHANGE,
     expected: "5",

accessible/tests/browser/fission/browser.ini

@@ -12,4 +12,3 @@ support-files =
 [browser_reframe_visibility.js]
 [browser_src_change.js]
 [browser_take_focus.js]
-skip-if = fission # Bug 1556627