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This CL moves the responsibility for acknowledging that swap has
occurred from SoftwareOutputSurface to SoftwareOutputDevice. This is to
allow handling asynchronous swap better. This CL should have no change
in behaviour but a follow up CL will add an overridden implementation of
SoftwareOutputDevice::OnSwapBuffers().

The main change is that instead of SoftwareOutputSurface holding a
TaskRunner the SoftwareOutputDevice does. Only the macOS
SoftwareOutputDevice needs a specific TaskRunner provided. All other
SoftwareOutputDevice implementations just grab the current one on
construction.

Bug: 826633
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I97f487db90fe18f4182d2210539f61f2cb694c6a
Reviewed-on: https://chromium-review.googlesource.com/1055476Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#557910}