Added a skin sample to the sample vendor project.

Change-Id: I2b2bfe2a7426dfcb4644255edde0d6bd24f8de81
diff --git a/sdk_addon/manifest.ini b/sdk_addon/manifest.ini
index 4184a4a..d1b29e9 100644
--- a/sdk_addon/manifest.ini
+++ b/sdk_addon/manifest.ini
@@ -17,6 +17,8 @@
 # details for each library
 com.example.android.platform_library=platform_library.jar;Sample optional plaform library
 
+# default skin name
+skin=WVGAMedDpi
 
 # USB Vendor ID
 # This 16-bit integer allows adb to detect new devices, by extending the list