Enable tracing in SkyShell

sky/shell/org/domokit/sky/shell/SkyActivity.java

Index: sky/shell/org/domokit/sky/shell/SkyActivity.java
diff --git a/sky/shell/org/domokit/sky/shell/SkyActivity.java b/sky/shell/org/domokit/sky/shell/SkyActivity.java
index e37114d64835c92c96afc130d1e7075cc48bccd6..c28f7289f4042deba2dc6cbd67fb3506e2d9995f 100644
--- a/sky/shell/org/domokit/sky/shell/SkyActivity.java
+++ b/sky/shell/org/domokit/sky/shell/SkyActivity.java
@@ -13,6 +13,7 @@ import android.view.WindowManager;
  * Base class for activities that use Sky.
  */
 public class SkyActivity extends Activity {
+    private TracingController mTracingController;
     private PlatformView mView;
 
     /**
@@ -32,6 +33,7 @@ public class SkyActivity extends Activity {
         SkyMain.ensureInitialized(getApplicationContext());
         mView = new PlatformView(this);
         setContentView(mView);
+        mTracingController = new TracingController(this);
     }
 
     public void loadUrl(String url) {