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The call to PermissionsHelper.setPermission was not always propagating to AXObjectCacheImpl right away. Previously we had a setTimeout(0), which was enough most of the time but not reliable, leaking to flaky tests. Fix by adding a new test API to determine whether the permission change has propagated to AXObjectCacheImpl, and don't resolve the promise to continue the test until it has propagated. Fixes: 1134459 Change-Id: I30ecf2514908bf19b824adde3929020194bd57c2 AX-Relnotes: N/A Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2815654 Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org> Reviewed-by: Adam Ettenberger <Adam.Ettenberger@microsoft.com> Cr-Commit-Position: refs/heads/master@{#871109}