Ensure on Windows AURA that the cursor stays within the bounds of the window during a LockMouse ope…

ui/views/widget/desktop_aura/desktop_root_window_host_win.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_win.cc
===================================================================
--- ui/views/widget/desktop_aura/desktop_root_window_host_win.cc	(revision 231601)
+++ ui/views/widget/desktop_aura/desktop_root_window_host_win.cc	(working copy)
@@ -467,13 +467,17 @@
 }
 
 bool DesktopRootWindowHostWin::ConfineCursorToRootWindow() {
-  return false;
+  RECT window_rect = root_window_->GetBoundsInScreen().ToRECT();
+  ::ClipCursor(&window_rect);
+  return true;
 }
 
 void DesktopRootWindowHostWin::UnConfineCursor() {
+  ::ClipCursor(NULL);
 }
 
 void DesktopRootWindowHostWin::OnCursorVisibilityChanged(bool show) {
+  ::ShowCursor(!!show);
 }
 
 void DesktopRootWindowHostWin::MoveCursorTo(const gfx::Point& location) {