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This CL simply adds the flag so that it can be used in
a future CL. This flag controls whether the WKWebView
snapshotting API is used to take snapshots for web pages
(not native pages) on iOS 11+.

The crbug to remove the flag is crbug.com/885003.

Bug: 739840
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Id00c4da93f5046e4a2b2af179abe3794a99a248e
Reviewed-on: https://chromium-review.googlesource.com/1229703
Commit-Queue: edchin <edchin@chromium.org>
Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#592108}