Add API to create GestureLibrary from FileDescriptor

GestureLibraries#fromFile takes a file path and returns a
GestureLibrary object. This change adds an equivalent API
GestureLibrary#fromFd that takes a FileDescriptor.

Test: GestureBuilder.apk still works properly
Bug: 139182427
Change-Id: Ie50f3a624703cf128d6ee34bb450bbe971ad1730
2 files changed