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This CL addresses an issue with <div role="progressbar"> not
being interesting on Android.

With this CL, kProgressIndicator's are now set to interesting
by default, making it possible for a user to linearly
navigate to the node via a screenreader.

We have added a new method, IsSeekControl, to differentiate
progress indicators, which are range type nodes, from the
other range type nodes, such as sliders, which allow the user
to use seek control to set the value. A user should not have
the ability to seek control and change the progress of an
indicator.


AX-Relnotes: Progress indicators (role="progressbar") are interesting on Android
Bug: 1129688
Change-Id: Ifca9a4048d695e33eedbb1b0bd43e97fcb8d29ea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424976Reviewed-by: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Cr-Commit-Position: refs/heads/master@{#810005}