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We want to propagate pointer-events: none information to cc to generate
correct hit testing data for viz. The plan is to have blink set the hit
testable bit on cc::Layers. In order to disambiguate the bit in surface
layer that represents the origin of the surface, we want to rename the
variable.

Bug: 841358
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I207815dcfad0f29b222b0a39c350f1e926aedac9
Reviewed-on: https://chromium-review.googlesource.com/1052506Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Commit-Queue: Xianda Sun <sunxd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558450}