Blimp OAuth2 token retreival on application start up.

chrome/browser/android/blimp/chrome_blimp_client_context_delegate.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 CHROME_BROWSER_ANDROID_BLIMP_CHROME_BLIMP_CLIENT_CONTEXT_DELEGATE_H_
 #define CHROME_BROWSER_ANDROID_BLIMP_CHROME_BLIMP_CLIENT_CONTEXT_DELEGATE_H_
 
+#include <memory>
+
 #include "base/macros.h"
 #include "blimp/client/public/blimp_client_context_delegate.h"
 
+class IdentityProvider;
 class Profile;
 
 namespace blimp {
 namespace client {
 class BlimpClientContext;
 class BlimpContents;
 }  // namespace client
 }  // namespace blimp
 
 // The BlimpClientContextDelegate for //chrome which provides the necessary
 // functionality required to run Blimp.
 class ChromeBlimpClientContextDelegate
     : public blimp::client::BlimpClientContextDelegate {
  public:
   // Constructs the object and attaches it to the BlimpClientContext that is
   // used for the given profile.
   explicit ChromeBlimpClientContextDelegate(Profile* profile);
   // Unattaches itself from the BlimpClientContext before going away.
   ~ChromeBlimpClientContextDelegate() override;
 
   // BlimpClientContextDelegate implementation.
   void AttachBlimpContentsHelpers(
       blimp::client::BlimpContents* blimp_contents) override;
   void OnAssignmentConnectionAttempted(
       blimp::client::AssignmentRequestResult result,
       const blimp::client::Assignment& assignment) override;
 
+  std::unique_ptr<IdentityProvider> CreateIdentityProvider() override;

[nyquist, 2016/08/12 05:47:05]

No empty line before this or the next method, as they're part of the
BlimpClientContextDelegate implementation.

[xingliu, 2016/08/12 17:58:28]

Done.

+
+  void OnError(BlimpClientContextDelegate::BlimpError error) override;
+
  private:
   // The profile this delegate is used for.
   Profile* profile_;
 
   // The BlimpClientContext this is the delegate for.
   blimp::client::BlimpClientContext* blimp_client_context_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBlimpClientContextDelegate);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_BLIMP_CHROME_BLIMP_CLIENT_CONTEXT_DELEGATE_H_