gfx::Screen: Replace GetWindowUnderCursor() with IsWindowUnderCursor().

ui/views/mus/screen_mus.cc

 // Copyright 2016 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 "ui/views/mus/screen_mus.h"
 
 #include "mojo/converters/geometry/geometry_type_converters.h"
 #include "services/shell/public/cpp/connection.h"
 #include "services/shell/public/cpp/connector.h"
+#include "ui/aura/window.h"
 #include "ui/display/display_observer.h"
 #include "ui/gfx/display_finder.h"
 #include "ui/views/mus/screen_mus_delegate.h"
 #include "ui/views/mus/window_manager_frame_values.h"
 
 namespace mojo {
 
 template <>
 struct TypeConverter<display::Display, mus::mojom::DisplayPtr> {
   static display::Display Convert(const mus::mojom::DisplayPtr& input) {
@@ skipping 146 matching lines @@
   if (!delegate_) {
     // TODO(erg): If we need the cursor point in the window manager, we'll need
     // to make |delegate_| required. It only recently changed to be optional.
     NOTIMPLEMENTED();
     return gfx::Point();
   }
 
   return delegate_->GetCursorScreenPoint();
 }
 
-gfx::NativeWindow ScreenMus::GetWindowUnderCursor() {
-  NOTIMPLEMENTED();
-  return nullptr;
+bool ScreenMus::IsWindowUnderCursor(gfx::NativeWindow window) {
+  return window->GetBoundsInScreen().Contains(GetCursorScreenPoint());

[sky, 2016/05/02 23:01:43]

I think you should check drawn here too.

 }
 
 gfx::NativeWindow ScreenMus::GetWindowAtScreenPoint(const gfx::Point& point) {
   NOTIMPLEMENTED();
   return nullptr;
 }
 
 display::Display ScreenMus::GetPrimaryDisplay() const {
   return displays_[primary_display_index_];
 }
@@ skipping 71 matching lines @@
   DCHECK_NE(-1, index);
   // Another display must become primary before the existing primary is
   // removed.
   DCHECK_NE(index, primary_display_index_);
   const display::Display display = displays_[index];
   FOR_EACH_OBSERVER(display::DisplayObserver, observers_,
                     OnDisplayRemoved(display));
 }
 
 }  // namespace views