Add the support for the new SystemInterface of android_npapi, expose

getApplicationDataDirectory to the plugin.

core/java/android/webkit/JWebCoreJavaBridge.java

@@ -185,6 +185,13 @@ final class JWebCoreJavaBridge extends Handler {
         return PluginManager.getInstance(null).getPluginDirecoties();
     }
 
+    /**
+     * Returns the path of the plugin data directory
+     */
+    private String getPluginSharedDataDirectory() {
+        return PluginManager.getInstance(null).getPluginSharedDataDirectory();
+    }
+
     /**
      * setSharedTimer
      * @param timemillis The relative time when the timer should fire

core/java/android/webkit/PluginManager.java

@@ -154,4 +154,8 @@ public class PluginManager {
         }
         return directories.toArray(new String[directories.size()]);
     }
+
+    String getPluginSharedDataDirectory() {
+        return mContext.getDir("plugins", 0).getPath();
+    }
 }