Enable autosubmit when input field is complete for the first time.

This CL enables autosubmit of the pac when input field is complete.
It updates the tests to ensure that they don't have to press the
submit button the first time the input field is complete.

Bug: 999389
Change-Id: I287f228de484c466df71f0a9d713d9020e2aee4b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784938Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693936}

ash/login/ui/parent_access_view.cc

@@ -707,7 +707,6 @@ ParentAccessView::ParentAccessView(const AccountId& account_id,
       l10n_util::GetStringUTF16(IDS_ASH_LOGIN_SUBMIT_BUTTON_ACCESSIBLE_NAME));
   submit_button_->SetFocusBehavior(FocusBehavior::ALWAYS);
   footer->AddChildView(submit_button_);
-
   add_spacer(kSubmitButtonBottomMarginDp);
 
   // Pin keyboard is only shown in tablet mode.
@@ -863,6 +862,12 @@ void ParentAccessView::OnInputChange(bool complete, bool last_field_active) {
   submit_button_->SetEnabled(complete);
 
   if (complete && last_field_active) {
+    if (auto_submit_enabled_) {
+      auto_submit_enabled_ = false;
+      SubmitCode();
+      return;
+    }
+
     // Moving focus is delayed by using PostTask to allow for proper
     // a11y announcements.
     base::ThreadTaskRunnerHandle::Get()->PostTask(

ash/login/ui/parent_access_view.h

@@ -184,6 +184,9 @@ class ASH_EXPORT ParentAccessView : public views::DialogDelegateView,
 
   State state_ = State::kNormal;
 
+  // Auto submit code when the last input has been inserted.
+  bool auto_submit_enabled_ = true;
+
   views::Label* title_label_ = nullptr;
   views::Label* description_label_ = nullptr;
   AccessCodeInput* access_code_view_ = nullptr;