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Introduce preview model

Authored by phuedx on Jan 27 2017, 1:35 PM.

Description

Introduce preview model

After the gateway has made a request, it processes the page. This
processing both mangles and processes the MediaWiki API response. The
latter step contains two pieces of related business logic:

  1. Deciding if a page has been modified recently.
  2. Processing the extract/deciding if it's viable (see processExtract).

In order to support switching between the MediaWiki API and RESTBase and
to simplify the event logging reducer when it comes to instrumenting the
"type" of preview, extract this business logic into a model.

Bug: T152004
Change-Id: I20f29657fcf94101a71ed13c0920508db71292ce