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>
diff --git a/examples/ManualSwapChainTest.cpp b/examples/ManualSwapChainTest.cpp
index b72672c..acd0d87 100644
--- a/examples/ManualSwapChainTest.cpp
+++ b/examples/ManualSwapChainTest.cpp
@@ -140,7 +140,7 @@
 
         wgpu::RenderPassEncoder pass = encoder.BeginRenderPass(&desc);
         pass.SetPipeline(trianglePipeline);
-        pass.Draw(3, 1, 0, 0);
+        pass.Draw(3);
         pass.EndPass();
     } else {
         data->clearCycle -= 1.0 / 60.f;