Add a basic UI to the Android Blimp client.

blimp/engine/browser/blimp_browser_main_parts.cc

Index: blimp/engine/browser/blimp_browser_main_parts.cc
diff --git a/blimp/engine/browser/blimp_browser_main_parts.cc b/blimp/engine/browser/blimp_browser_main_parts.cc
index 232d8120d3b66e902ec1731f47d7f97d2091d338..8a8e533687926b9e6db7aa3270bbc5db7bcdb45a 100644
--- a/blimp/engine/browser/blimp_browser_main_parts.cc
+++ b/blimp/engine/browser/blimp_browser_main_parts.cc
@@ -46,8 +46,10 @@ void BlimpBrowserMainParts::PreMainMessageLoopRun() {
   message.set_type(BlimpMessage::CONTROL);
   message.mutable_control()->set_type(ControlMessage::CREATE_TAB);
   engine_session_->OnBlimpMessage(message);
-  message.mutable_control()->set_type(ControlMessage::LOAD_URL);
-  message.mutable_control()->mutable_load_url()->set_url(
+  message.clear_control();
+  message.set_type(BlimpMessage::NAVIGATION);
+  message.mutable_navigation()->set_type(NavigationMessage::LOAD_URL);
+  message.mutable_navigation()->mutable_load_url()->set_url(
       "https://www.google.com/");
   engine_session_->OnBlimpMessage(message);
 }