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This CL adds contentDescription to the dialog_container_view in
TabGridDialog. By adding this, we also fix the issue of the dialog
auto-focusing on dialog toolbar back button when dialog opens. This bug
is because that without a contentDescription, dialog container view will
shift its focus automatically to its first "announce-able" child view
which is the back button and announce that in a11y mode. After this CL,
it will focus on the whole dialog and make the correct announcement
instead.

Bug: 1111962
Change-Id: I44e21dd5f8088e9903fa7306d56460ba2fc0feef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2387198
Commit-Queue: Yue Zhang <yuezhanggg@chromium.org>
Auto-Submit: Yue Zhang <yuezhanggg@chromium.org>
Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803677}