Quick Answers: Dismiss the view to prevent duplication

Check if the quick answers view is not dismissed when creating new ones
to prevent multiple views showing.

This is also a short term workaround of the view stuck issue.

Bug: b/162596353
Test: Manual Test
Change-Id: I5bc418547077622d637687796196c6de4aa3842e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335755Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Commit-Queue: Yue Li <updowndota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795106}

ash/quick_answers/quick_answers_ui_controller.cc

@@ -36,7 +36,14 @@ void QuickAnswersUiController::CreateQuickAnswersView(
     const gfx::Rect& bounds,
     const std::string& title,
     const std::string& query) {
-  DCHECK(!quick_answers_view_);
+  // Currently there are timing issues that causes the quick answers view is not
+  // dismissed. TODO(updowndota): Remove the special handling after the root
+  // cause is found.
+  if (quick_answers_view_) {
+    LOG(ERROR) << "Quick answers view not dismissed.";
+    CloseQuickAnswersView();
+  }
+
   DCHECK(!user_consent_view_);
   SetActiveQuery(query);
   quick_answers_view_ = new QuickAnswersView(bounds, title, this);