Make a VoiceOver announcement when a page has loaded.

ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm

Index: ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm
diff --git a/ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm b/ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm
index 48d04753790ffba50f48f50cb13942a9dba26f83..0582dd1fdea6e7e7b758767809dfbde88436f4de 100644
--- a/ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm
+++ b/ios/chrome/browser/ui/toolbar/web_toolbar_controller.mm
@@ -1631,6 +1631,10 @@ CGRect RectShiftedDownAndResizedForStatusBar(CGRect rect) {
                                                               animated:YES
                                                             completion:nil];
                                  }];
+      UIAccessibilityPostNotification(
+          UIAccessibilityAnnouncementNotification,
+          l10n_util::GetNSString(
+              IDS_IOS_PAGE_LOADED_ACCESSIBILITY_ANNOUNCEMENT));
     }
     CGFloat delay = _unitTesting ? 0 : kLoadCompleteHideProgressBarDelay;
     [self performSelector:@selector(hideProgressBarAndTakeSnapshot)