tree 62a617a9741f518221040d56fda836a25067ad19
parent 2ae84e946193d883749658cfedfae7e971e3d27e
author Natasha Lee <natlee@microsoft.com> 1589851772 +0000
committer Commit Bot service account <commit-bot@chromium.org> 1589851772 +0000

Refactor MapRequestTracker to be its own class file.

All the buffer backend files had basically the same implemenations
of MapRequestTracker and the tracker was owned by device backends.
This refactor puts MapRequestTracker into its own file
and has the tracker be owned by DeviceBase and BufferBase.

Bug: dawn:400
Change-Id: Id28422b575e9c04d4435d5f119e0ffe08c2d1ce8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/21760
Commit-Queue: Natasha Lee <natlee@microsoft.com>
Reviewed-by: Austin Eng <enga@chromium.org>