Migrate cc::TouchAction to enum class

Bug: 720553
Change-Id: Id6a64091a29ab7aae9e3e990e6b7f6a4a39a5208
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1947739
Commit-Queue: Henrique Ferreiro <hferreiro@igalia.com>
Reviewed-by: David Bokan <bokan@chromium.org>
Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#725352}
56 files changed