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 289602adc22ae098e17f0cd8f963513e88c38b07..7852d9cedee834339990b34eec8912291cca0a1c 100644
--- a/blimp/client/core/blimp_client_context_impl.cc
+++ b/blimp/client/core/blimp_client_context_impl.cc
@@ -72,6 +72,19 @@ BlimpClientContextImpl::~BlimpClientContextImpl() {
   io_thread_task_runner_->DeleteSoon(FROM_HERE, net_components_.release());
 }
 
+void BlimpClientContextImpl::Connect() {

[nyquist, 2016/08/12 05:47:04]

Nit: You see if it makes sense to order these functions like in the header?

[xingliu, 2016/08/12 21:11:18]

Done.

+  // Lazy initialization of IdentitySource.
+  if (!identity_source_) {
+    DCHECK(delegate_);
+    identity_source_ =
+        base::MakeUnique<IdentitySource>(delegate_->CreateIdentityProvider());
+    identity_source_->SetDelegate(delegate_);
+  }
+
+  // Start Blimp authentication flow.
+  identity_source_->Connect();
+}
+
 void BlimpClientContextImpl::SetDelegate(BlimpClientContextDelegate* delegate) {
   delegate_ = delegate;
 }