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This is a reland of 7456a5e0

Use a custom lambda instead of implementing PrintTo(SkBlendMode).

Original change's description:
> Add names to tuple-parameterized tests
>
> Test names can only contain alphanumeric characters, plus underscores.
> testing::PrintToStringParamName() stringifies tuples using characters
> that aren't valid for test names.
>
> Add a similar function which joins each element using underscores. This
> will generate valid names for test parameterization, provided each
> element of the tuple can be written using valid characters.
>
> Bug: 1092945, 1117587
> Change-Id: I868b1d4040a93bdbf763dbb45b94ff15f181dd18
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2376882
> Reviewed-by: kylechar <kylechar@chromium.org>
> Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#803182}

Bug: 1092945, 1117587, 1123758
Change-Id: I4b3614bae62b557ac5da011f0dd5be1cb3256afb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2386388
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Reviewed-by: kylechar <kylechar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803631}