Blimp OAuth2 token retreival on application start up.

blimp/client/public/blimp_client_context.h

 // 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.
 
 #ifndef BLIMP_CLIENT_PUBLIC_BLIMP_CLIENT_CONTEXT_H_
 #define BLIMP_CLIENT_PUBLIC_BLIMP_CLIENT_CONTEXT_H_
 
 #include <memory>
 
 #include "base/memory/ref_counted.h"
 #include "base/single_thread_task_runner.h"
 #include "blimp/client/public/blimp_client_context_delegate.h"
 #include "blimp/client/public/contents/blimp_contents.h"
 #include "components/keyed_service/core/keyed_service.h"
+#include "google_apis/gaia/identity_provider.h"
 
 #if defined(OS_ANDROID)
 #include "base/android/jni_android.h"
 #endif  // defined(OS_ANDROID)
 
 namespace base {
 class SupportsUserData;
 }
 
 namespace blimp {
@@ skipping 18 matching lines @@
   // operations.
   static BlimpClientContext* Create(
       scoped_refptr<base::SingleThreadTaskRunner> io_thread_task_runner);
 
   // The delegate provides all the required functionality from the embedder.
   virtual void SetDelegate(BlimpClientContextDelegate* delegate) = 0;
 
   // Creates a new BlimpContents.
   virtual std::unique_ptr<BlimpContents> CreateBlimpContents() = 0;
 
+  // Create OAuth2 token authenticator.
+  virtual void CreateAuthenticator(

[nyquist, 2016/08/10 01:20:34]

Could you move this to the BlimpClientContextDelegate instead? Something like:
std::unique_ptr<IdentityProvider> CreateIdentityProvider()?

[xingliu, 2016/08/10 21:03:15]

Done. This is great idea.

+      std::unique_ptr<IdentityProvider> identity_provider) = 0;
+
  protected:
   BlimpClientContext() = default;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(BlimpClientContext);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_PUBLIC_BLIMP_CLIENT_CONTEXT_H_