Blimp OAuth2 token retreival on application start up.

blimp/client/core/blimp_client_context_impl.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/blimp_client_context_impl.h"
 
 #include "base/bind.h"
 #include "base/memory/ptr_util.h"
 #include "base/message_loop/message_loop.h"
 #include "base/threading/sequenced_task_runner_handle.h"
@@ skipping 42 matching lines @@
   // registered.
   io_thread_task_runner_->PostTask(
       FROM_HERE, base::Bind(&ClientNetworkComponents::Initialize,
                             base::Unretained(net_components_.get())));
 }
 
 BlimpClientContextImpl::~BlimpClientContextImpl() {
   io_thread_task_runner_->DeleteSoon(FROM_HERE, net_components_.release());
 }
 
+void BlimpClientContextImpl::Connect() {
+  if (authenticator_)
+    authenticator_->Connect();

[nyquist, 2016/08/10 01:20:33]

If there is no authenticator_ if you have the creation of the IdentityProvider
in the delegate, you'd be able to create on-the-fly to ensure that you always
have it here.

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

Done. Now do lazy init and create IdentityProvider in the delegate.

+}
+
 void BlimpClientContextImpl::SetDelegate(BlimpClientContextDelegate* delegate) {
   delegate_ = delegate;
 }
 
 std::unique_ptr<BlimpContents> BlimpClientContextImpl::CreateBlimpContents() {
   std::unique_ptr<BlimpContents> blimp_contents =
       base::MakeUnique<BlimpContentsImpl>();
   delegate_->AttachBlimpContentsHelpers(blimp_contents.get());
   return blimp_contents;
 }
 
+void BlimpClientContextImpl::CreateAuthenticator(
+    std::unique_ptr<IdentityProvider> identity_provider) {
+    authenticator_ = base::MakeUnique<Authenticator>(
+        std::move(identity_provider));
+}
+
 void BlimpClientContextImpl::OnConnected() {}
 
 void BlimpClientContextImpl::OnDisconnected(int result) {}
 
 }  // namespace client
 }  // namespace blimp