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When using the WKWebView snapshot API, the specified frame should be in
the coordinate space of the web view rather than the BVC.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: Idc5f28745085e36891d77a4005e10f4d3bfd66c5
Reviewed-on: https://chromium-review.googlesource.com/c/1257828Reviewed-by: edchin <edchin@chromium.org>
Reviewed-by: Mark Cogan <marq@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596248}