[MERGE] Change the signature on VersionedFiles adapters to allow less typing and more flexability inside adapters.

[John Arbash Meinel]

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Robert Collins wrote:
> ``VersionedFiles`` record adapters have had their signature change
> from ``(record, record.get_bytes_as(record.storage_kind))`` to
> ``(record)`` reducing excess duplication and allowing adapters
> to access private data in record to obtain content more
> efficiently. (Robert Collins)
> 
> This reduces friction showing up in the
> versionedfiles-for-network-streaming project I am working on with
> Andrew.
> 
> -Rob
> 

Would it be reasonable to do this in a more backwards compatible fashion
by doing:


- -    def get_bytes(self, factory, annotated_compressed_bytes):
+    def get_bytes(self, factory, annotated_compressed_bytes=None):
       if annotated_compressed_bytes is None:
         annotated_compressed_bytes = factory.read_bytes_as(....)

?

John
=:->

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