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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/+/2376882Reviewed-by: kylechar <kylechar@chromium.org>
Commit-Queue: Sean Gilhuly <sgilhuly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#803182}