mus: Disregard windows that explicitly set can_accept_events to be false when sending events.

services/ui/public/cpp/window_tree_client.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SERVICES_UI_PUBLIC_CPP_WINDOW_TREE_CLIENT_H_
 #define SERVICES_UI_PUBLIC_CPP_WINDOW_TREE_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 185 matching lines @@
   // Windows are initially hidden, use SetVisible(true) to show.
   Window* NewWindow() { return NewWindow(nullptr); }
   Window* NewWindow(
       const std::map<std::string, std::vector<uint8_t>>* properties);
   Window* NewTopLevelWindow(
       const std::map<std::string, std::vector<uint8_t>>* properties);
 
   void AddObserver(WindowTreeClientObserver* observer);
   void RemoveObserver(WindowTreeClientObserver* observer);
 
+  void SetCanAcceptEvents(Id window_id, bool can_accept_events);
+
 #if !defined(NDEBUG)
   std::string GetDebugWindowHierarchy() const;
   void BuildDebugInfo(const std::string& depth,
                       Window* window,
                       std::string* result) const;
 #endif
 
  private:
   friend class WindowTreeClientPrivate;
 
@@ skipping 177 matching lines @@
   mojo::Binding<mojom::WindowTreeClient> binding_;
   mojom::WindowTreePtr tree_ptr_;
   // Typically this is the value contained in |tree_ptr_|, but tests may
   // directly set this.
   mojom::WindowTree* tree_;
 
   bool delete_on_no_roots_;
 
   bool in_destructor_;
 
+  // Whether this window can accept events.
+  // Initialize it to be true since server window will also initialize
+  // can_accept_events_ to be true.
+  bool can_accept_events_ = true;
+
   // A mapping to shared memory that is one 32 bit integer long. The window
   // server uses this to let us synchronously read the cursor location.
   mojo::ScopedSharedBufferMapping cursor_location_mapping_;
 
   base::ObserverList<WindowTreeClientObserver> observers_;
 
   std::unique_ptr<mojo::AssociatedBinding<mojom::WindowManager>>
       window_manager_internal_;
   mojom::WindowManagerClientAssociatedPtr window_manager_internal_client_;
 
@@ skipping 14 matching lines @@
   base::Callback<void(bool)> on_current_move_finished_;
 
   base::WeakPtrFactory<WindowTreeClient> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowTreeClient);
 };
 
 }  // namespace ui
 
 #endif  // SERVICES_UI_PUBLIC_CPP_WINDOW_TREE_CLIENT_H_