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When user press tab in ListView, VIEW_SELECTED event is dispatched.
This event is not only dispatched from the newly selected node but also
from List itself and child nodes of it. Previously filtering out these
event were took place in Android AccessibilityService side.
This CL migrates the event handling to Chrome side.

Also, this type of event was converted to chrome selection event, but
focus event is more appropriate. This CL also fixes it.

Bug: b/148837372
Bug: b/146916101
Bug: b/143336586
Bug: b/139645142
Bug: b/152374820
Test: unit_tests --gtest_filter="AXTreeSourceArcTest.*"
Test: manual with ag/10901596. tab navigation works in PlayStore hamburger menu and talkback test appp list menu.
Change-Id: Ia8d2f3bb71dcb5a9b9b796dc89e4d8d2a733a940
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129381
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Reviewed-by: Sara Kato <sarakato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756140}