Enable CursorManager::LockCursor to lock cursor visibility.

ui/aura/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/aura/root_window_host_win.h"
 
 #include <windows.h>
 
 #include <algorithm>
 
@@ skipping 154 matching lines @@
   }
 }
 
 void RootWindowHostWin::ReleaseCapture() {
   if (has_capture_) {
     has_capture_ = false;
     ::ReleaseCapture();
   }
 }
 
-void RootWindowHostWin::ShowCursor(bool show) {
-  // NOTIMPLEMENTED();
-}
-
 bool RootWindowHostWin::QueryMouseLocation(gfx::Point* location_return) {
   POINT pt;
   GetCursorPos(&pt);
   ScreenToClient(hwnd(), &pt);
   const gfx::Size size = GetBounds().size();
   *location_return =
       gfx::Point(max(0, min(size.width(), static_cast<int>(pt.x))),
                  max(0, min(size.height(), static_cast<int>(pt.y))));
   return (pt.x >= 0 && static_cast<int>(pt.x) < size.width() &&
           pt.y >= 0 && static_cast<int>(pt.y) < size.height());
@@ skipping 83 matching lines @@
 }
 
 void RootWindowHostWin::OnSize(UINT param, const CSize& size) {
   // Minimizing resizes the window to 0x0 which causes our layout to go all
   // screwy, so we just ignore it.
   if (param != SIZE_MINIMIZED)
     delegate_->OnHostResized(gfx::Size(size.cx, size.cy));
 }
 
 }  // namespace aura