How to proxy anonymous inner class?

`cannot proxy inaccessible class class com.leanplum.testproj.MessagesListActivity$1MyListAdapter`

Getting this error, when trying to run:
```
proxyAdapterClass = ProxyBuilder.forClass(existingListAdapter.getClass())
.dexCache(activity.getDir("leanplumClassDir", Context.MODE_PRIVATE))
.handler(handler)
.build();
```

Looks like proxying anonymous inner classes is not supported by dexmaker, is it?

Start by reproducing the reported error with the ProxyBuilder.forClass(existingListAdapter.getClass()) call and the anonymous MessagesListActivity$1MyListAdapter class shown in the issue. Trace how ProxyBuilder handles inaccessible classes, then establish whether anonymous inner classes are supported and what behavior or documentation would mark the issue done.

Written by the indexing model from the issue text.