Propagate error messages to UI for blimp.

blimp/client/core/session/identity_source.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "blimp/client/core/session/identity_source.h"
 
 #include "base/command_line.h"
 #include "base/memory/ptr_util.h"
 #include "blimp/client/core/switches/blimp_client_switches.h"
 
@@ skipping 38 matching lines @@
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(switches::kEngineIP)) {
     if (token_callback_) {
       token_callback_.Run(std::string());
     }
     return;
   }
 
   // User must sign in first to get an OAuth2 token.
   const std::string& account_id = identity_provider_->GetActiveAccountId();
   if (account_id.empty()) {
-    delegate_->OnAuthenticationError(
-        BlimpClientContextDelegate::AuthError::NOT_SIGNED_IN);
+    VLOG(1) << "User is not signed in before connection to Blimp engine.";
     return;
   }
 
   account_id_ = account_id;
   is_fetching_token_ = true;
   FetchAuthToken();
 }
 
 // Add sign in state observer.
 void IdentitySource::AddObserver(IdentityProvider::Observer* observer) {
@@ skipping 38 matching lines @@
             << retry_times_;
     FetchAuthToken();
     return;
   }
 
   // If request failure was not caused by cancellation, or reached max retry
   // times on request cancellation, propagate the error to embedder.
   is_fetching_token_ = false;
   retry_times_ = 0;
   VLOG(1) << "OAuth2 token error: " << error.state();
+
+  // Propagate the error.
   DCHECK(delegate_);
-  delegate_->OnAuthenticationError(
-      BlimpClientContextDelegate::AuthError::OAUTH_TOKEN_FAIL);
+  delegate_->OnAuthenticationError(error);
 }
 
 void IdentitySource::OnRefreshTokenAvailable(const std::string& account_id) {
   if (account_id != account_id_) {
     return;
   }
 
   identity_provider_->RemoveActiveAccountRefreshTokenObserver(this);
   FetchAuthToken();
 }
 
 void IdentitySource::FetchAuthToken() {
   OAuth2TokenService* token_service = identity_provider_->GetTokenService();
   DCHECK(token_service);
 
   if (token_service->RefreshTokenIsAvailable(account_id_)) {
     OAuth2TokenService::ScopeSet scopes;
     scopes.insert(kOAuth2TokenScope);
     token_request_ = token_service->StartRequest(account_id_, scopes, this);
   } else {
     identity_provider_->AddActiveAccountRefreshTokenObserver(this);
   }
 }
 
 }  // namespace client
 }  // namespace blimp