Reland "Enable the tessellation atlas for general path rendering"

This is a reland of a1179182

Original change's description:
> Enable the tessellation atlas for general path rendering
>
> This is a drastic change to how non-MSAA paths are rendered in Chrome.
> After this CL, and as long as multisample support is enabled, non-convex
> paths with 256^2 pixels or fewer will be rendered by tessellation in a
> 2048x2048 multisampled alpha8 atlas. This will give tremendous
> improvements in path rendering times and overall CPU usge. This change
> will also cause Skia to quit caching path bitmaps in many cases, so we
> can expect to see some memory savings. Dropping the path cache is not
> expected to impact performance much because the tiles themselves are
> their own bitmap cache.
>
> Bug: chromium:928984
> Bug: skia:12258
> Change-Id: I1a4e2dba65d2db4a74f766aa944e4a64782df271
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3062518


> Auto-Submit: Chris Dalton <csmartdalton@chromium.org>
> Commit-Queue: Chris Dalton <csmartdalton@chromium.org>
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Reviewed-by: Michael Ludwig <michaelludwig@google.com>
> Reviewed-by: Justin Novosad <junov@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#907388}

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux-blink-rel;luci.chromium.try:linux-chromeos-compile-dbg;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Bug: chromium:928984
Bug: skia:12258
Bug: b/195095846
Change-Id: Id5868368be4cb53d53ae9d9039d49e30c019179a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3065900


Reviewed-by: Michael Ludwig <michaelludwig@google.com>
Reviewed-by: Justin Novosad <junov@chromium.org>
Commit-Queue: Chris Dalton <csmartdalton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#908671}