Hosted apps on OS X now act more like a native app.

chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h

Index: chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h
diff --git a/chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h b/chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h
index 8ac49432086d84b5748090b73365b6e842bbeaa2..46b70d3669d8c0e80a0372df98d20d2d23c9e1f7 100644
--- a/chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h
+++ b/chrome/browser/apps/app_shim/extension_app_shim_handler_mac.h
@@ -6,13 +6,17 @@
 #define CHROME_BROWSER_APPS_APP_SHIM_EXTENSION_APP_SHIM_HANDLER_MAC_H_
 
 #include <map>
+#include <set>
 #include <string>
 #include <vector>
 
+
 #include "apps/app_lifetime_monitor.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "chrome/browser/apps/app_shim/app_shim_handler_mac.h"
+#include "chrome/browser/ui/browser.h"
+#include "chrome/browser/ui/browser_list_observer.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "extensions/browser/app_window/app_window_registry.h"
@@ -38,7 +42,8 @@ namespace apps {
 // extension.
 class ExtensionAppShimHandler : public AppShimHandler,
                                 public content::NotificationObserver,
-                                public AppLifetimeMonitor::Observer {
+                                public AppLifetimeMonitor::Observer,
+                                public chrome::BrowserListObserver {
  public:
   class Delegate {
    public:
@@ -74,8 +79,13 @@ class ExtensionAppShimHandler : public AppShimHandler,
 
   static void QuitAppForWindow(extensions::AppWindow* app_window);
 
+  static void QuitHostedAppForWindow(Browser* browser,
+                                     const extensions::Extension* extension);
+
   static void HideAppForWindow(extensions::AppWindow* app_window);
 
+  static void HideHostedApp(Profile* profile, const std::string& app_id);
+
   static void FocusAppForWindow(extensions::AppWindow* app_window);
 
   // Brings the window to the front without showing it and instructs the shim to
@@ -115,9 +125,15 @@ class ExtensionAppShimHandler : public AppShimHandler,
                const content::NotificationSource& source,
                const content::NotificationDetails& details) override;
 
+  // chrome::BrowserListObserver overrides;
+  void OnBrowserAdded(Browser* browser) override;
+  void OnBrowserRemoved(Browser* browser) override;
+
  protected:
   typedef std::map<std::pair<Profile*, std::string>, AppShimHandler::Host*>
       HostMap;
+  typedef std::set<Browser*> BrowserSet;
+  typedef std::map<std::string, BrowserSet> AppBrowserMap;
 
   // Exposed for testing.
   void set_delegate(Delegate* delegate);
@@ -145,6 +161,9 @@ class ExtensionAppShimHandler : public AppShimHandler,
 
   HostMap hosts_;
 
+  // A map of app ids to associated browser windows.
+  AppBrowserMap app_browser_windows_;
+
   content::NotificationRegistrar registrar_;
 
   base::WeakPtrFactory<ExtensionAppShimHandler> weak_factory_;