Invoke cursor-hiding logic on touch for Windows

ui/views/widget/desktop_aura/desktop_root_window_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
diff --git a/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc b/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
index 40908c27b316b925d23b49dc6fdf01e56d9707df..0f4e296f8f0815fcad316c31b2d62bb57e043baf 100644
--- a/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
+++ b/ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
@@ -730,6 +730,8 @@ void DesktopRootWindowHostWin::HandleAccelerator(
 }
 
 void DesktopRootWindowHostWin::HandleCreate() {
+  ::ShowCursor(true);

[tdanderson, 2013/11/22 02:03:36]

Adding this line will prevent the problem you described in
https://codereview.chromium.org/56053004 from occurring. If you tap on the
wrench menu and then tap on the page to dismiss the menu, the cursor becomes
visible when moved. Without this line, the cursor remains invisible when moved
within the browser window.

However, I am not entirely sure why this works.

[tdanderson, 2013/11/22 02:27:03]

I should add that the |delegate_| in CursorManager is a
DesktopNativeCursorManager, which only knows about a single RootWindow. Ideally,
upon a cursor visibility change, I would like to iterate over all root windows
to inform their cursor clients of the change (instead of just a single root
window). But this doesn't seem possible given that we're operating in desktop
mode.

+
   // TODO(beng): moar
   NOTIMPLEMENTED();