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/CppHelloTriangle.cpp

@@ -163,7 +163,7 @@ void frame() {
         pass.SetBindGroup(0, bindGroup);
         pass.SetVertexBuffer(0, vertexBuffer);
         pass.SetIndexBuffer(indexBuffer);
-        pass.DrawIndexed(3, 1, 0, 0, 0);
+        pass.DrawIndexed(3);
         pass.EndPass();
     }