Get around silly `final` methods in `ContentResolver` with Mockito and `delegatesTo`.
The Robolectric library presumes that people always want to test content providers by
manually invoking the `query`/`update`/`delete` methods on the `ShadowContentResolver`.
While that is a great feature for testing, we have helper methods that require testing,
and these methods accept either a _real_ `ContentResolver` or `Context`. Robolectric
did some cool magic in terms of intercepting runtime calls to content resolvers and
forwarding them to the "shadow" verison, to deal with final/package private/etc methods.
However, as a side effect, the `ShadowContentProvider` _is not a `ContentProvider` as
far as the Java compiler is concerned.
By utilising Mockito + `delegatesTo` method, we are able to achieve what is required:
* An actual `ContentProvider` instance.
* It forwards calls to the `ShadowContentProvider` provided by Robolectric.
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