Log the version of the WebView package used.

To aid in debugging app behaviour when WebView updates may be present,
log the package name, version name, and version code of the WebView
package when we are about to load it into an application. Do this before
we actually load any part of the package in case of an issue loading it
in the first place.

Change-Id: Id653bad431760b7ead8e3f8eb29f9d6a8bb68d07