Call ShowRootWindow on NativeWindow's RootWindow to display the window.

content/shell/shell_stacking_client_ash.cc

Index: content/shell/shell_stacking_client_ash.cc
diff --git a/content/shell/shell_stacking_client_ash.cc b/content/shell/shell_stacking_client_ash.cc
index f9e7c0a644f2fa8a7ce9fd96f1db654d9e700e27..c558572439c593fe576c3b016ae6caba3b55b5c7 100644
--- a/content/shell/shell_stacking_client_ash.cc
+++ b/content/shell/shell_stacking_client_ash.cc
@@ -13,7 +13,10 @@
 
 namespace content {
 
-ShellStackingClientAsh::ShellStackingClientAsh() {
+ShellStackingClientAsh::ShellStackingClientAsh(
+    scoped_ptr<aura::RootWindow> root_window)
+    : root_window_(root_window.Pass()){
+  Init();
 }
 
 ShellStackingClientAsh::~ShellStackingClientAsh() {
@@ -23,33 +26,30 @@ ShellStackingClientAsh::~ShellStackingClientAsh() {
   aura::client::SetStackingClient(NULL);
 }
 
+void ShellStackingClientAsh::Init() {
+  focus_client_.reset(new aura::FocusManager);
+  aura::client::SetFocusClient(root_window_.get(), focus_client_.get());
+
+  root_window_event_filter_ = new views::corewm::CompoundEventFilter;
+  // Pass ownership of the filter to the root_window.
+  root_window_->SetEventFilter(root_window_event_filter_);
+
+  input_method_filter_.reset(new views::corewm::InputMethodEventFilter(
+      root_window_->GetAcceleratedWidget()));
+  input_method_filter_->SetInputMethodPropertyInRootWindow(
+      root_window_.get());
+  root_window_event_filter_->AddHandler(input_method_filter_.get());
+
+  test_activation_client_.reset(
+      new aura::test::TestActivationClient(root_window_.get()));
+  capture_client_.reset(
+      new aura::client::DefaultCaptureClient(root_window_.get()));
+}
+
 aura::Window* ShellStackingClientAsh::GetDefaultParent(
     aura::Window* context,
     aura::Window* window,
     const gfx::Rect& bounds) {
-  if (!root_window_.get()) {
-    root_window_.reset(new aura::RootWindow(
-        aura::RootWindow::CreateParams(gfx::Rect(100, 100))));
-    root_window_->Init();
-    focus_client_.reset(new aura::FocusManager);
-    aura::client::SetFocusClient(root_window_.get(), focus_client_.get());
-
-    root_window_event_filter_ = new views::corewm::CompoundEventFilter;
-    // Pass ownership of the filter to the root_window.
-    root_window_->SetEventFilter(root_window_event_filter_);
-
-    input_method_filter_.reset(new views::corewm::InputMethodEventFilter(
-                                   root_window_->GetAcceleratedWidget()));
-    input_method_filter_->SetInputMethodPropertyInRootWindow(
-        root_window_.get());
-    root_window_event_filter_->AddHandler(input_method_filter_.get());
-
-    test_activation_client_.reset(
-        new aura::test::TestActivationClient(root_window_.get()));
-
-    capture_client_.reset(
-        new aura::client::DefaultCaptureClient(root_window_.get()));
-  }
   return root_window_.get();
 }