mash: Repost mouse pressed event when closing Ash system tray

ui/views/mus/platform_window_mus.h

Index: ui/views/mus/platform_window_mus.h
diff --git a/ui/views/mus/platform_window_mus.h b/ui/views/mus/platform_window_mus.h
index 7e9caa0961ba675d4e4fac68c1aca0e6627fb862..979957a106542b9b203cc959bcf9305d41defc69 100644
--- a/ui/views/mus/platform_window_mus.h
+++ b/ui/views/mus/platform_window_mus.h
@@ -11,6 +11,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/message_loop/message_loop.h"
 #include "components/mus/public/cpp/input_event_handler.h"
 #include "components/mus/public/cpp/window_observer.h"
 #include "ui/platform_window/platform_window.h"
@@ -34,7 +35,8 @@ namespace views {
 class VIEWS_MUS_EXPORT PlatformWindowMus
     : public NON_EXPORTED_BASE(ui::PlatformWindow),
       public mus::WindowObserver,
-      public NON_EXPORTED_BASE(mus::InputEventHandler) {
+      public NON_EXPORTED_BASE(mus::InputEventHandler),
+      public base::MessageLoop::NestingObserver {
  public:
   PlatformWindowMus(ui::PlatformWindowDelegate* delegate,
                     shell::Connector* connector,
@@ -86,13 +88,22 @@ class VIEWS_MUS_EXPORT PlatformWindowMus
   void OnWindowInputEvent(
       mus::Window* view,
       const ui::Event& event,
-      std::unique_ptr<base::Callback<void(bool)>>* ack_callback) override;
+      std::unique_ptr<base::Callback<void(mus::mojom::EventResult)>>*
+          ack_callback) override;
+
+  // base::MessageLoop::NestingObserver:
+  void OnBeginNestedMessageLoop() override;
+
+  bool ShouldRepostEvent(const ui::Event& event, bool had_capture);
 
   ui::PlatformWindowDelegate* delegate_;
   mus::Window* mus_window_;
   mus::mojom::ShowState show_state_;
   mus::mojom::Cursor last_cursor_;
 
+  std::unique_ptr<base::Callback<void(mus::mojom::EventResult)>>
+      event_ack_callback_;
+
   // True if OnWindowDestroyed() has been received.
   bool mus_window_destroyed_;