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This CL adds IsCrossOrigin, IsTopFrame and IsAdFrame info to
Media.EME.RequestMediaKeySystemAccess UKM.

Bug: 1068642
Change-Id: I103e1fdd11f0a01868b21d2f8a4d9340ac4e1a49
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139994
Commit-Queue: Xiaohan Wang <xhwang@chromium.org>
Reviewed-by: John Rummell <jrummell@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757653}