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This feature flag will be used for adding Context Menu support to
iFrames by using the PostMessage WebKit API to return the found element.
(Instead of directly returning the element details from
__gCrWeb.getElementFromPoint)

Bug: 228355
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I17fec9afb74e7fe5f7b2818902f4b872ba8d445a
Reviewed-on: https://chromium-review.googlesource.com/896546
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Eugene But <eugenebut@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533983}