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This CL adds a method to the view class called IsRTL that replaces calls
to base::i18n::IsRTL() in the view impl. The result of View::IsRTL may
be overridden with View::SetIsRTL().

The purpose of this change is to allow views that should always be
presented in left-to-right do so with ease. For reference, see the next
CL in the relation chain.

Bug: 1106037
Change-Id: Ieee3b1667979f9f010ac971bcca3ea4d902f9d93
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2300799
Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#789331}