Invoke cursor-hiding logic on touch for Windows

ui/views/widget/desktop_aura/desktop_root_window_host_win.cc

 // Copyright (c) 2012 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/widget/desktop_aura/desktop_root_window_host_win.h"
 
 #include "base/win/metro.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 712 matching lines @@
 bool DesktopRootWindowHostWin::HandleCommand(int command) {
   return GetWidget()->widget_delegate()->ExecuteWindowsCommand(command);
 }
 
 void DesktopRootWindowHostWin::HandleAccelerator(
     const ui::Accelerator& accelerator) {
   GetWidget()->GetFocusManager()->ProcessAccelerator(accelerator);
 }
 
 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();
 
   native_widget_delegate_->OnNativeWidgetCreated(true);
 
   // 1. Window property association
   // 2. MouseWheel.
 }
 
 void DesktopRootWindowHostWin::HandleDestroying() {
@@ skipping 209 matching lines @@
 
 // static
 DesktopRootWindowHost* DesktopRootWindowHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopRootWindowHostWin(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views