wgpu::InputStepMode -> VertexStepMode

See https://github.com/gpuweb/gpuweb/pull/1927

Adds a typedef to make a gradual deprecation.

Bug: dawn:1023
Change-Id: Ic81a933a95556fbf5726056530788dde017a1449
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/59442
Reviewed-by: Austin Eng <enga@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>
diff --git a/src/dawn_native/opengl/RenderPipelineGL.cpp b/src/dawn_native/opengl/RenderPipelineGL.cpp
index 4cd55dd..aed8c01 100644
--- a/src/dawn_native/opengl/RenderPipelineGL.cpp
+++ b/src/dawn_native/opengl/RenderPipelineGL.cpp
@@ -267,9 +267,9 @@
                 gl.VertexAttribDivisor(glAttrib, 0xffffffff);
             } else {
                 switch (vertexBuffer.stepMode) {
-                    case wgpu::InputStepMode::Vertex:
+                    case wgpu::VertexStepMode::Vertex:
                         break;
-                    case wgpu::InputStepMode::Instance:
+                    case wgpu::VertexStepMode::Instance:
                         gl.VertexAttribDivisor(glAttrib, 1);
                         break;
                 }