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Adds a "PdfPartialLoading" feature to control whether or not the PDF
viewer tries to use partial loading. The default state is enabled, as
this feature has shipped already, but we would like to experiment with
disabling it to address certain problems related to partial loading.

Bug: 1115149
Change-Id: Ie66fddf5b633269226bc01fca20ac7013f0c1e7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2349429
Commit-Queue: K. Moon <kmoon@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#797378}