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This CL implements render pass overlay on macOS. With this
implementation, SkiaRenderer draws render passes with filters with a
DDL recorder canvas, and then stores DDL and related information in
the CALayerOverlay. The SkiaOutputSurfaceImplOnGpu will create overlay
shared images backing base on the DDL, and then replays DDL against the
backing, and then the backings will be presented as overlays.

However this CL doesn't recycle overlay shared images. It always creates
new shared images for each render pass overlay. Shared image backing
recycling will be implemented in follow-up CLs.

Since recycling is not implemented, so the the render pass overlay is
not enabled in this CL.

Bug: 1100728
Change-Id: I8389393a790b9e0fdc0dda69c60afd2566a68dd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2388885
Commit-Queue: Peng Huang <penghuang@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804832}