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This CL imports the portion of OpenCV needed to use its EMD
implementation. This API will be fuzzed (see
https://crrev.com/c/2166582), and is intended to run only in the
renderer process.

Bug: 1068616
Change-Id: I16cd87b493290dc83f85c6b78a1c02b89ae53b90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2163432Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: Bettina Dea <bdea@chromium.org>
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#766428}