Layout panels on top of their launcher icons

ash/shell/window_watcher.cc

Index: ash/shell/window_watcher.cc
diff --git a/ash/shell/window_watcher.cc b/ash/shell/window_watcher.cc
index ec14e1bc13f7c83e5243e69107e3c256d3357e97..5398a8a006d80a3a5780ba1e5e8aa5215cab1af0 100644
--- a/ash/shell/window_watcher.cc
+++ b/ash/shell/window_watcher.cc
@@ -7,14 +7,18 @@
 #include "ash/launcher/launcher.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/shell.h"
+#include "ash/shell_window_ids.h"
 #include "ui/aura/window.h"
 
 namespace ash {
 namespace shell {
 
 WindowWatcher::WindowWatcher()
-    : window_(ash::Shell::GetInstance()->launcher()->window_container()) {
+    : window_(ash::Shell::GetInstance()->launcher()->window_container()),
+      panel_container_(ash::Shell::GetInstance()->GetContainer(
+          ash::internal::kShellWindowId_PanelContainer)) {
   window_->AddObserver(this);
+  panel_container_->AddObserver(this);
 }
 
 WindowWatcher::~WindowWatcher() {
@@ -37,7 +41,8 @@ ash::LauncherID WindowWatcher::GetIDByWindow(aura::Window* window) const {
 
 // aura::WindowObserver overrides:
 void WindowWatcher::OnWindowAdded(aura::Window* new_window) {
-  if (new_window->type() != aura::client::WINDOW_TYPE_NORMAL)
+  if (new_window->type() != aura::client::WINDOW_TYPE_NORMAL &&
+      new_window->type() != aura::client::WINDOW_TYPE_PANEL)
     return;
 
   static int image_count = 0;