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This CL fixes SurfaceRange::IsInRangeExclusive in the case when the embed
tokens are different by comparing with either ends of the range.
In addition, it adds 2 extra utility functions to SurfaceRange which are needed
to make the code cleaner for following work.

Bug: 867531
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: Ia542e94b13c566989f3764c32cad4016bfddd32b
Reviewed-on: https://chromium-review.googlesource.com/1159100
Commit-Queue: Andre Kaba <akaba@google.com>
Commit-Queue: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Fady Samuel <fsamuel@chromium.org>
Reviewed-by: Saman Sami <samans@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580313}