Add the defaults for Draw and DrawIndexed

And updates all places in tests and examples where they could have been
used.

Bug: dawn:22
Change-Id: Ic36e3f1810037b5addeb9e971b1da28fdd1da183
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/18380
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>

examples/Animometer.cpp

@@ -161,7 +161,7 @@ void frame() {
         for (size_t i = 0; i < kNumTriangles; i++) {
             uint32_t offset = i * sizeof(ShaderData);
             pass.SetBindGroup(0, bindGroup, 1, &offset);
-            pass.Draw(3, 1, 0, 0);
+            pass.Draw(3);
         }
 
         pass.EndPass();