[TIMOB-4982] Geolocation not working consistently on Android WebView (with suggested patch)

My experience shows that geolocation doesn't work consistently in an Android WebView, even when android.permission.ACCESS_FINE_LOCATION is added to tiapp.xml. To replicate: * Create simple app that loads a web page that uses geolocation APIs. In this case I used the KitchenSink app and changed the external URL in [web_views.js](https://github.com/appcelerator/titanium_mobile/blob/master/demos/KitchenSink/Resources/examples/web_views.js) to a test page for W3C browser geolocation, http://code.google.com/apis/maps/documentation/javascript/examples/map-geolocation.html. * Add to tiapp.xml: **

<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

* Save and build as usual. Install to Android device and to iOS device for comparison. * Verify that the permission privilege was added to build/android/AndroidManifest.xml. * Open KitchenSink on Android device and go to Base UI > Views > Web Views > External URL. Geolocation test fails. * Open KitchenSink in iOS device and repeat process. App requests location permission and test completes. Here is my suggested resolution to the problem: * Add the following to source code for TiWebChromeClient.java: **

public void onGeolocationPermissionsShowPrompt(String origin, android.webkit.GeolocationPermissions.Callback callback) {
     callback.invoke(origin, true, false);
}

* Build and update titanium-ui.jar. * Clean and build project and install new build to Android device. * Open KitchenSink on Android device and go to Base UI > Views > Web Views > External URL. Geolocation test succeeds!