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Currently WebView nodes are explicitly not ignored and not sorted in ARC
accessibility. This rule should be applied to nodes from
AccessibilityNodeProvider, too.

This CL adds is_virtual_node in accessibility_helper.mojom and
AccessibilityInfoData.IsVirtualView(), replacing current IsWebViewNode().

Bug; b:145262470

Bug: b:151130475
Bug: crbug:1053397
Test: unit_tests --gtest_filter="AXTreeSourceArcTest.*"
Test: manual. Nodes from WebViews, Pickers, and Amazon Kindle app are correctly populated, works with Android side change (http://ag/10662400).
Change-Id: I216bf6f26cb8e911ce0fe899400d503db6073be4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2102288Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Sara Kato <sarakato@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Hiroki Sato <hirokisato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#751313}