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

services/ui/ws/window_finder.cc

 // Copyright 2015 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.
 
 #include "services/ui/ws/window_finder.h"
 
 #include "base/containers/adapters.h"
 #include "services/ui/surfaces/surfaces_state.h"
 #include "services/ui/ws/server_window.h"
 #include "services/ui/ws/server_window_delegate.h"
 #include "services/ui/ws/server_window_surface.h"
 #include "services/ui/ws/server_window_surface_manager.h"
 #include "services/ui/ws/window_coordinate_conversions.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/point_f.h"
 #include "ui/gfx/transform.h"
 
 namespace ui {
 namespace ws {
 
 bool IsValidWindowForEvents(ServerWindow* window) {
   ServerWindowSurfaceManager* surface_manager = window->surface_manager();
   return surface_manager &&
          surface_manager->HasSurfaceOfType(mojom::SurfaceType::DEFAULT);
 }
 
 ServerWindow* FindDeepestVisibleWindowForEvents(ServerWindow* window,
                                                 gfx::Point* location) {
+  if (!window->can_accept_events())
+    return nullptr;
+
   const ServerWindow::Windows& children = window->children();
   for (ServerWindow* child : base::Reversed(children)) {
     if (!child->visible())
       continue;
 
+    if (!child->can_accept_events())

[msw, 2016/07/12 22:07:23]

optional nit: combine with if statement above.

[riajiang, 2016/07/13 00:01:46]

Done.

+      continue;
+
     // TODO(sky): support transform.
     gfx::Point child_location(location->x() - child->bounds().x(),
                               location->y() - child->bounds().y());
     gfx::Rect child_bounds(child->bounds().size());
     child_bounds.Inset(-child->extended_hit_test_region().left(),
                        -child->extended_hit_test_region().top(),
                        -child->extended_hit_test_region().right(),
                        -child->extended_hit_test_region().bottom());
     if (!child_bounds.Contains(child_location))
       continue;
@@ skipping 15 matching lines @@
   ServerWindow* current = window;
   while (current->parent()) {
     transform.Translate(-current->bounds().x(), -current->bounds().y());
     current = current->parent();
   }
   return transform;
 }
 
 }  // namespace ws
 }  // namespace ui