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Adds a "PdfIncrementalLoading" feature to control whether or not the PDF
viewer tries to use incremental 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 incremental
loading.

crrev.com/c/2349429 added a similar control for "partial" loading. The
two features are orthogonal: Incremental loading tries to load a PDF
before all the bytes have arrived, while partial loading tries to fetch
the bytes out of order. (Partial loading currently is not useful without
incremental loading, however.)

The linearized.pdf file was derived from the equivalent file in
third_party/pdfium/testing/resources. For the purposes of this test, the
file has been relinearized and decompressed using qpdf.

Bug: 1115149
Change-Id: Ib9f9d3d66b9c5d051528a6d49b4662b70d236649
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2352217
Commit-Queue: K. Moon <kmoon@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798225}