ESSL->WGSL: Emit basic function signatures ...signatures don't yet include types or parameters. See WGSLOutput_test.cpp for a sample translation. Bug: angleproject:8662 Change-Id: I93273156f72ba193441e737074bd1a8a054f2ea9 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5582949 Commit-Queue: Matthew Denton <mpdenton@chromium.org> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Liza Burakova <liza@chromium.org>