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This CL addresses various coupled bugs in both text selection and non-
default granularity navigation for input fields/contenteditables on
Android. It fixes various issues with improper announcements,
announcements at the wrong time, and text selection not functioning in
general. It also addresses AccessibilityEvent discrepancies under-the-
hood in cases where we appeared to have the correct functionality to
the user, but only by happenstance as we were passing bad data to
TalkBack.

This CL addresses:
Bug 1041649 - Text selection on Android broken/not functioning
Bug 1017466 - Contenteditable word granularity navigation not reading
correctly
Bug 1041587 - Beginning/End of field announcements being read at
wrong index

Bug: 1041649,1017466,1041587
Change-Id: I30a8888e99e90356398d14319fbdf225839f5dac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1998829
Commit-Queue: Mark Schillaci <mschillaci@google.com>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#734171}