Add Observatory to sky dart_controller

sky/shell/sky_main.cc

Index: sky/shell/sky_main.cc
diff --git a/sky/shell/sky_main.cc b/sky/shell/sky_main.cc
index 4a10ab0df3f30fa1a575c62db55b7bb00e1d116f..ae8aa16e8eacf8c8ccf940b4aa4f8ec3180d6151 100644
--- a/sky/shell/sky_main.cc
+++ b/sky/shell/sky_main.cc
@@ -17,6 +17,8 @@
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/simple_thread.h"
+#include "bin/eventhandler.h"
+#include "bin/thread.h"
 #include "jni/SkyMain_jni.h"
 #include "sky/shell/shell.h"
 #include "ui/gl/gl_surface_egl.h"
@@ -51,6 +53,10 @@ static void Init(JNIEnv* env, jclass clazz, jobject context) {
   base::CommandLine::Init(0, nullptr);
   InitializeLogging();
 
+  // Bootstrap 'dart:io' event handler.
+  dart::bin::Thread::InitOnce();
+  dart::bin::EventHandler::Start();
+
   g_java_message_loop.Get().reset(new base::MessageLoopForUI);
   base::MessageLoopForUI::current()->Start();