SkyDemo should use explicit intents

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

Index: sky/shell/android/org/domokit/sky/shell/SkyActivity.java
diff --git a/sky/shell/android/org/domokit/sky/shell/SkyActivity.java b/sky/shell/android/org/domokit/sky/shell/SkyActivity.java
index 84a08af0672fb1ef10e6b597abd4cde2d1d1d246..0724ebf9a1d4efcfafaafdb4538ff2ce4af1f106 100644
--- a/sky/shell/android/org/domokit/sky/shell/SkyActivity.java
+++ b/sky/shell/android/org/domokit/sky/shell/SkyActivity.java
@@ -41,7 +41,7 @@ public class SkyActivity extends Activity {
         setContentView(mView);
         mTracingController = new TracingController(this);
 
-        loadSnapshotIfAvailable();
+        onSkyReady();
     }
 
     /**
@@ -65,7 +65,10 @@ public class SkyActivity extends Activity {
         super.onBackPressed();
     }
 
-    private void loadSnapshotIfAvailable() {
+    /**
+      * Override this function to customize startup behavior.
+      */
+    protected void onSkyReady() {
         File dataDir = new File(PathUtils.getDataDirectory(this));
         File snapshot = new File(dataDir, SkyApplication.SNAPSHOT);
         if (snapshot.exists()) {