Add a standalone SkyShell.apk for testing

sky/shell/apk/src/org/domokit/sky/shell/SkyMain.java

Index: sky/shell/apk/src/org/domokit/sky/shell/SkyMain.java
diff --git a/sky/shell/apk/src/org/domokit/sky/shell/SkyMain.java b/sky/shell/apk/src/org/domokit/sky/shell/SkyMain.java
new file mode 100644
index 0000000000000000000000000000000000000000..0f373e4026c88e9ebfb28003c2be7ec313b63d35
--- /dev/null
+++ b/sky/shell/apk/src/org/domokit/sky/shell/SkyMain.java
@@ -0,0 +1,50 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.domokit.sky.shell;
+
+import android.content.Context;
+import android.util.Log;
+
+import org.chromium.base.JNINamespace;
+
+/**
+ * A class to intialize the native code.
+ **/
+@JNINamespace("sky::shell")
+public class SkyMain {
+    private static final String TAG = "SkyMain";
+
+    /**
+     * A guard flag for calling nativeInit() only once.
+     **/
+    private static boolean sInitialized = false;
+
+    /**
+     * Initializes the native system.
+     **/
+    static void ensureInitialized(Context applicationContext) {
+        if (sInitialized)
+            return;
+        try {
+            nativeInit(applicationContext);
+            sInitialized = true;
+        } catch (Exception e) {
+            Log.e(TAG, "SkyMain initialization failed.", e);
+            throw new RuntimeException(e);
+        }
+    }
+
+    /**
+     * Starts the specified application in the specified context.
+     *
+     * @return <code>true</code> if an application has been launched.
+     **/
+    static boolean start() {
+        return nativeStart();
+    }
+
+    private static native void nativeInit(Context context);
+    private static native boolean nativeStart();
+}