[signin] Support for CrOS and OAuth2AccessTokenConsumer services.

chrome/browser/chromeos/login/online_attempt.h

Index: chrome/browser/chromeos/login/online_attempt.h
diff --git a/chrome/browser/chromeos/login/online_attempt.h b/chrome/browser/chromeos/login/online_attempt.h
index 65166828cc4b3ca0900edf0288bdb060f0a7aae5..c45f149c2648d407890c9cda5412066dff05c732 100644
--- a/chrome/browser/chromeos/login/online_attempt.h
+++ b/chrome/browser/chromeos/login/online_attempt.h
@@ -12,9 +12,11 @@
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
 #include "chrome/browser/chromeos/login/login_status_consumer.h"
 #include "chrome/browser/net/gaia/gaia_oauth_consumer.h"
 #include "chrome/browser/net/gaia/gaia_oauth_fetcher.h"
+#include "chrome/browser/signin/signin_internals_util.h"
 #include "google_apis/gaia/gaia_auth_consumer.h"
 #include "google_apis/gaia/google_service_auth_error.h"
 
@@ -53,6 +55,13 @@ class OnlineAttempt
   virtual void OnOAuthLoginFailure(
       const GoogleServiceAuthError& error) OVERRIDE;
 
+  // Methods to register (and remove) observers interested in signin
+  // diagnostics related information updates.
+  void AddSigninDiagnosticsObserver(
+      signin_internals_util::SigninDiagnosticsObserver* observer);
+  void RemoveSigninDiagnosticsObserver(
+      signin_internals_util::SigninDiagnosticsObserver* observer);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(OnlineAttemptTest, LoginSuccess);
   FRIEND_TEST_ALL_PREFIXES(OnlineAttemptTest, TwoFactorSuccess);
@@ -85,6 +94,10 @@ class OnlineAttempt
   // Whether we're willing to re-try the ClientLogin attempt.
   bool try_again_;
 
+  // A list of interested observers.
+  ObserverList<signin_internals_util::SigninDiagnosticsObserver>
+      signin_diagnostics_observers_;
+
   friend class OnlineAttemptTest;
   DISALLOW_COPY_AND_ASSIGN(OnlineAttempt);
 };