Integrate UI with authentication flow.

blimp/client/core/session/identity_source.h

Index: blimp/client/core/session/identity_source.h
diff --git a/blimp/client/core/session/identity_source.h b/blimp/client/core/session/identity_source.h
index 972ba76c4d60552f9e16350536ffb76082145197..30663102f5a05dc9fd066e93921a531ee97c4055 100644
--- a/blimp/client/core/session/identity_source.h
+++ b/blimp/client/core/session/identity_source.h
@@ -10,7 +10,6 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
-
 #include "blimp/client/public/blimp_client_context_delegate.h"
 #include "google_apis/gaia/identity_provider.h"
 #include "google_apis/gaia/oauth2_token_service.h"
@@ -34,6 +33,12 @@ class IdentitySource : public OAuth2TokenService::Consumer,
   // Duplicate connect calls during token fetching will be ignored.
   void Connect();
 
+  // Add sign in state observer.
+  void AddObserver(IdentityProvider::Observer* observer);
+
+  // Remove sign in state observer.
+  void RemoveObserver(IdentityProvider::Observer* observer);
+
   // OAuth2TokenService::Consumer implementation.
   void OnGetTokenSuccess(const OAuth2TokenService::Request* request,
                          const std::string& access_token,
@@ -68,6 +73,9 @@ class IdentitySource : public OAuth2TokenService::Consumer,
   // Account id of current active user, used during token request.
   std::string account_id_;
 
+  // Current retry count due to request cancellation.
+  int retry_times_;
+
   BlimpClientContextDelegate* delegate_;
 
   DISALLOW_COPY_AND_ASSIGN(IdentitySource);