Propagate error messages to UI for blimp.

blimp/client/core/context/blimp_client_context_impl.cc

Index: blimp/client/core/context/blimp_client_context_impl.cc
diff --git a/blimp/client/core/context/blimp_client_context_impl.cc b/blimp/client/core/context/blimp_client_context_impl.cc
index e9eda6ae2de473637f806adc9f7556721a620a36..b8278ecfe3b0628a4417df974ec42df1da24f9e2 100644
--- a/blimp/client/core/context/blimp_client_context_impl.cc
+++ b/blimp/client/core/context/blimp_client_context_impl.cc
@@ -108,6 +108,8 @@ BlimpClientContextImpl::BlimpClientContextImpl(
   RegisterFeatures();
   InitializeSettings();
 
+  connection_status_.AddObserver(this);
+
   // Initialize must only be posted after the features have been
   // registered.
   io_thread_task_runner_->PostTask(
@@ -119,6 +121,7 @@ BlimpClientContextImpl::BlimpClientContextImpl(
 
 BlimpClientContextImpl::~BlimpClientContextImpl() {
   io_thread_task_runner_->DeleteSoon(FROM_HERE, net_components_.release());
+  connection_status_.RemoveObserver(this);
 }
 
 void BlimpClientContextImpl::SetDelegate(BlimpClientContextDelegate* delegate) {
@@ -254,5 +257,21 @@ void BlimpClientContextImpl::OnImageDecodeError() {
   DropConnection();
 }
 
+void BlimpClientContextImpl::OnConnected() {
+  if (delegate_) {
+    delegate_->OnConnected();
+  }
+}
+
+void BlimpClientContextImpl::OnDisconnected(int result) {
+  if (delegate_) {
+    if (result >= 0) {
+      delegate_->OnEngineDisconnected(result);
+    } else {
+      delegate_->OnNetworkDisconnected(result);
+    }
+  }
+}
+
 }  // namespace client
 }  // namespace blimp