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Created a new DataFilesParser class which wraps the file IO operations,
allowing us to mock these calls in unit tests. The file reading
operation is kicked-off in a task posted on the thread pool to make
sure we're not blocking the calling thread.

In this CL, the highlighted game is simply the first game in the
catalog. A future CL will update that logic.

Bug: 1018201
Change-Id: Ic7bb5795344a7a3b4017587d7041ace77d921b00
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1928205
Commit-Queue: Sebastien Lalancette <seblalancette@chromium.org>
Reviewed-by: Chris Sharp <csharp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719144}