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Currently UiElementContainerView does not auto scroll when the focus in the
AssistantCardElementView changes, e.g. during Tab traversing.
This patch surfaces the OnFocusChangedInPage event from WebContentsImpl
to NavigableContentsObserver, so that the UiElementContainerView can do
scroll accordinglly.
In this patch, if the bounds of the focused node is clipped by the
container, it will scroll the node to the center of the container.

Bug: 966806
Test: manual
Change-Id: I974db35731b85fdcb957d9898ae921a12dbd7607
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1885253
Commit-Queue: Tao Wu <wutao@chromium.org>
Reviewed-by: Camille Lamy <clamy@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713180}