Make mWebView accessible from Python code

Author: kollivier

pythonforandroid/bootstraps/webview/build/src/main/java/org/kivy/android/PythonActivity.java

@@ -53,7 +53,7 @@ public class PythonActivity extends Activity {
     public static boolean mBrokenLibraries;
 
     protected static ViewGroup mLayout;
-    protected static WebView mWebView;
+    public static WebView mWebView;
 
     protected static Thread mPythonThread;