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Use the typemapping system rather than one-off functions to perform the
conversion. This brings the Skia code into alignment with Mojo IPC best
practices: Among other things, this lets conversion between the Mojo and
Skia types to signal deserialization failure when appropriate.

Bug: 1144462
Change-Id: Id35c3f1d84907e28b39c29da27a84e3c2a7a8c72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521221Reviewed-by: danakj <danakj@chromium.org>
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825135}