Make the offset of SetIndexBuffer default to 0

BUG=dawn:22

Change-Id: Icc4f03c3f49b610ef5f620b4c26a6ae24ed6c774
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/12040
Reviewed-by: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/examples/CppHelloTriangle.cpp b/examples/CppHelloTriangle.cpp
index 0fd317c..2437e3a 100644
--- a/examples/CppHelloTriangle.cpp
+++ b/examples/CppHelloTriangle.cpp
@@ -162,7 +162,7 @@
         pass.SetPipeline(pipeline);
         pass.SetBindGroup(0, bindGroup);
         pass.SetVertexBuffer(0, vertexBuffer);
-        pass.SetIndexBuffer(indexBuffer, 0);
+        pass.SetIndexBuffer(indexBuffer);
         pass.DrawIndexed(3, 1, 0, 0, 0);
         pass.EndPass();
     }