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Information about the HID report descriptor, including a hierarchical
representation of the described collections and reports, will be made
available through the WebHID API. This CL adds information about input,
output, and feature reports contained within a collection, as well as a
list of the children of the collection.

BUG=890096

Change-Id: I7d40fef222baf9456dda0920ee88550ca02ff41f
Reviewed-on: https://chromium-review.googlesource.com/c/1381263
Commit-Queue: Matt Reynolds <mattreynolds@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636632}