make menus, bubbles, etc. top level windows on aura

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 5997cf1a75b76aedaeabb22b99ac3d5d2dc04399..1099c63fe9a227533482dab6ae2a240ca863e849 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
@@ -167,6 +167,10 @@ aura::RootWindow* DesktopRootWindowHostWin::Init(
   return root_window_;
 }
 
+void DesktopRootWindowHostWin::InitFocus(aura::Window* window) {
+  focus_client_->FocusWindow(window);
+}
+
 void DesktopRootWindowHostWin::Close() {
   message_handler_->Close();
 }
@@ -374,12 +378,21 @@ void DesktopRootWindowHostWin::ToggleFullScreen() {
 
 gfx::Rect DesktopRootWindowHostWin::GetBounds() const {
   // Match the logic in HWNDMessageHandler::ClientAreaSizeChanged().
-  return WidgetSizeIsClientSize() ?
-      GetClientAreaBoundsInScreen() : GetWindowBoundsInScreen();
+  gfx::Rect bounds(WidgetSizeIsClientSize() ? GetClientAreaBoundsInScreen()
+                                            : GetWindowBoundsInScreen());
+  gfx::Rect without_expansion(bounds.x() - window_expansion_.x(),
+                              bounds.y() - window_expansion_.y(),
+                              bounds.width() - window_expansion_.width(),
+                              bounds.height() - window_expansion_.height());
+  return without_expansion;
 }
 
 void DesktopRootWindowHostWin::SetBounds(const gfx::Rect& bounds) {
-  message_handler_->SetBounds(bounds);
+  gfx::Rect expanded(bounds.x() + window_expansion_.x(),
+                     bounds.y() + window_expansion_.y(),
+                     bounds.width() + window_expansion_.width(),
+                     bounds.height() + window_expansion_.height());
+  message_handler_->SetBounds(expanded);
 }
 
 gfx::Insets DesktopRootWindowHostWin::GetInsets() const {
@@ -454,6 +467,12 @@ void DesktopRootWindowHostWin::OnDeviceScaleFactorChanged(
 void DesktopRootWindowHostWin::PrepareForShutdown() {
 }
 
+void DesktopRootWindowHostWin::SetHostWindowExpansion(const gfx::Rect& extra) {
+  gfx::Rect bounds_without_expansion = GetBounds();
+  window_expansion_ = extra;
+  SetBounds(bounds_without_expansion);
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // DesktopRootWindowHostWin, HWNDMessageHandlerDelegate implementation:
 
@@ -656,10 +675,12 @@ void DesktopRootWindowHostWin::HandleVisibilityChanged(bool visible) {
 
 void DesktopRootWindowHostWin::HandleClientSizeChanged(
     const gfx::Size& new_size) {
+  gfx::Size without_expansion(new_size.width() - window_expansion_.width(),
+                              new_size.height() - window_expansion_.height());
   if (root_window_host_delegate_)
     root_window_host_delegate_->OnHostResized(new_size);
   // TODO(beng): replace with a layout manager??
-  content_window_->SetBounds(gfx::Rect(new_size));
+  content_window_->SetBounds(gfx::Rect(without_expansion));
 }
 
 void DesktopRootWindowHostWin::HandleFrameChanged() {