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This CL extends the cc::PaintWorkletInput::PropertyKey to support
the native property types.

This is needed in order to support composite background color
animation, which is described here:
https://docs.google.com/document/d/1usCnwWs8HsH5FU_185q6MsrZehFmpl5QgbbB4pvHIjI/edit

This CL doesn't change any behavior, because right now only native
property uses the PaintWorkletInput.

Bug: 1139008
Change-Id: I4e2a7417a982c39106dd28ce43fe7452151e8511
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528937Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: Anders Hartvoll Ruud <andruud@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#828201}