Blimp OAuth2 token retreival on application start up.

blimp/client/core/blimp_client_context_impl.cc

Index: blimp/client/core/blimp_client_context_impl.cc
diff --git a/blimp/client/core/blimp_client_context_impl.cc b/blimp/client/core/blimp_client_context_impl.cc
index 076fc78f34ea64ed7f5f8af03e5d9688d9169896..f2860b1ef3f7c31ed0fa01e8a17318e5de1c530e 100644
--- a/blimp/client/core/blimp_client_context_impl.cc
+++ b/blimp/client/core/blimp_client_context_impl.cc
@@ -60,6 +60,11 @@ 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;
 }
@@ -71,6 +76,12 @@ std::unique_ptr<BlimpContents> BlimpClientContextImpl::CreateBlimpContents() {
   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) {}