WebGPU: Skip primitive topology conversion for DrawArrays For non-indexed draw calls, no index format is needed for the stripIndexFormat. Bug: angleproject:356399840 Change-Id: Ie2c9805a2c257d94ea5f1bca026287873e4d6781 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/5748449 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>