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This CL hides virtual keyboard when parent access widget is being
shown. It achieves this by doing the following:
1. Hide virtual keyboard when parent access widget is shown.
2. Prevent views::Textfield from calling views::Textfield::
   ShowVirtualKeyboardIfEnabled() by making changes in
   ParentAccessView::AccessCodeInput and AccessibleInputField.

Bug: 938705
Change-Id: I5199a8a6290e2cf47602b0ef130b4aa5c05b7ad9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1784337Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: Aga Wronska <agawronska@chromium.org>
Commit-Queue: Yilkal Abe <yilkal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693893}