shaders.skia.org was passing in a Malloc'd TypedArray for uniforms
(to avoid unnecessary copying of that buffer on every frame).
However, CanvasKit would always take ownership of that buffer and
free it when the shader was freed. CanvasKit should only take
ownership (and clean up) the uniform buffer if it was not
copied into pre-malloc'd memory.
This also adds a handy make target that builds CanvasKit
and copies it into the proper place in the infra repository
to run the shaders app locally.
See also: https://skia-review.googlesource.com/c/buildbot/+/543436
Change-Id: I6c6b7f94f8c8571f9ce0613ccdd7fceb0f315a12
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/543416
Reviewed-by: Jorge Betancourt <jmbetancourt@google.com>
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