Update task manager icon in shelf when kAppIconLargeKey changes.

Bug: 943775
Change-Id: Ic72893c1be5cdc815e14566bb6da942f1a4a1625
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1532897
Commit-Queue: Evan Stade <estade@chromium.org>
Commit-Queue: James Cook <jamescook@chromium.org>
Auto-Submit: Evan Stade <estade@chromium.org>
Reviewed-by: James Cook <jamescook@chromium.org>
Cr-Commit-Position: refs/heads/master@{#642723}

ash/shelf/shelf_window_watcher.cc

@@ -135,7 +135,8 @@ void ShelfWindowWatcher::UserWindowObserver::OnWindowPropertyChanged(
         ShelfID::Deserialize(window->GetProperty(kShelfIDKey)));
   }
 
-  if (key == aura::client::kAppIconKey || key == aura::client::kWindowIconKey ||
+  if (key == aura::client::kAppIconLargeKey ||
+      key == aura::client::kAppIconKey || key == aura::client::kWindowIconKey ||
       key == aura::client::kDrawAttentionKey || key == kShelfItemTypeKey ||
       key == kShelfIDKey) {
     window_watcher_->OnUserWindowPropertyChanged(window);