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which has a related icon in ToolbarPageActionIconContainerView

1) Added logic to make sure an inactive bubble (if any) related to
icons in the ToolbarPageActionIconContainerView can be activated for
accessibility.

2) Added logic to update icons in ToolbarPageActionIconContainerView
whenever toolbar refreshes itself.

Bug: 932818
Change-Id: Ibbbeeb8446cf48c7a2de047f0a292051b79583ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1542566
Commit-Queue: Siyu An <siyua@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Jared Saul <jsaul@google.com>
Cr-Commit-Position: refs/heads/master@{#646666}