Add KeepAliveStateObserver, add the Restart option

chrome/browser/lifetime/scoped_keep_alive.h

Index: chrome/browser/lifetime/scoped_keep_alive.h
diff --git a/chrome/browser/lifetime/scoped_keep_alive.h b/chrome/browser/lifetime/scoped_keep_alive.h
index 76d01496d79d32f8d18b0a930d3ef90b2e59d80c..adaefc76de7a4a033fd202354e57797fd4d04273 100644
--- a/chrome/browser/lifetime/scoped_keep_alive.h
+++ b/chrome/browser/lifetime/scoped_keep_alive.h
@@ -9,17 +9,19 @@
 
 namespace keep_alive {
 enum class Origin;
+enum class RestartOption;
 }
 
 // Registers with KeepAliveRegistry on creation and unregisters them
 // on destruction. Use these objects with a scoped_ptr for easy management.
 class ScopedKeepAlive {
  public:
-  explicit ScopedKeepAlive(keep_alive::Origin origin);
+  ScopedKeepAlive(keep_alive::Origin origin, keep_alive::RestartOption restart);
   ~ScopedKeepAlive();
 
  private:
   const keep_alive::Origin origin_;
+  const keep_alive::RestartOption restart_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedKeepAlive);
 };