arc-bridge: Add the ARC Bridge Service

chrome/browser/ui/ash/chrome_shell_delegate.h

Index: chrome/browser/ui/ash/chrome_shell_delegate.h
diff --git a/chrome/browser/ui/ash/chrome_shell_delegate.h b/chrome/browser/ui/ash/chrome_shell_delegate.h
index c2ed9ea56456500d4e231f38c7ca935450fb0edf..747fefb559346fe41d6b5e5a4890802e03ecbc69 100644
--- a/chrome/browser/ui/ash/chrome_shell_delegate.h
+++ b/chrome/browser/ui/ash/chrome_shell_delegate.h
@@ -17,6 +17,10 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
+#if defined(OS_CHROMEOS) && defined(ENABLE_ARC)
+#include "ash/shell_observer.h"
+#endif
+
 class Browser;
 
 namespace ash {
@@ -88,6 +92,21 @@ class ChromeShellDelegate : public ash::ShellDelegate,
                const content::NotificationDetails& details) override;
 
  private:
+#if defined(OS_CHROMEOS) && defined(ENABLE_ARC)
+  // An Observer to track session state and start/stop ARC accordingly.
+  class ArcSessionObserver : public ash::ShellObserver {
+   public:
+    ArcSessionObserver();
+    ~ArcSessionObserver() override;
+
+    // ash::ShellObserver overrides:
+    void OnLoginStateChanged(ash::user::LoginStatus status) override;
+
+   private:
+    DISALLOW_COPY_AND_ASSIGN(ArcSessionObserver);
+  };
+#endif
+
   void PlatformInit();
 
   static ChromeShellDelegate* instance_;
@@ -107,6 +126,11 @@ class ChromeShellDelegate : public ash::ShellDelegate,
       display_configuration_observer_;
 #endif
 
+#if defined(OS_CHROMEOS) && defined(ENABLE_ARC)
+  // An Observer to track session state and start/stop ARC accordingly.
+  scoped_ptr<ArcSessionObserver> arc_session_observer_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(ChromeShellDelegate);
 };