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

ui/views/mus/screen_mus.cc

Index: ui/views/mus/screen_mus.cc
diff --git a/ui/views/mus/screen_mus.cc b/ui/views/mus/screen_mus.cc
index eb853388771be0aefb5a1c16fcb54293dcf13673..b3baf30c0766eade6eb9af228dafb8eec5582b3f 100644
--- a/ui/views/mus/screen_mus.cc
+++ b/ui/views/mus/screen_mus.cc
@@ -7,6 +7,7 @@
 #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"
@@ -173,9 +174,12 @@ gfx::Point ScreenMus::GetCursorScreenPoint() {
   return delegate_->GetCursorScreenPoint();
 }
 
-gfx::NativeWindow ScreenMus::GetWindowUnderCursor() {
-  NOTIMPLEMENTED();
-  return nullptr;
+bool ScreenMus::IsWindowUnderCursor(gfx::NativeWindow window) {
+  if (!window)
+    return false;
+
+  return window->IsVisible() &&

[sky, 2016/05/02 23:59:37]

IsVisible->IsDrawn

[sky, 2016/05/03 00:02:48]

D'OH. IsVisible is what you want. Sorry.

[Elliot Glaysher, 2016/05/03 00:13:19]

As discussed in person, this is an aura window, not a mus window. Leaving as is.

+      window->GetBoundsInScreen().Contains(GetCursorScreenPoint());
 }
 
 gfx::NativeWindow ScreenMus::GetWindowAtScreenPoint(const gfx::Point& point) {