Change buffer-related sizes/offsets to be uint64_t

Bug: dawn:121
Change-Id: I9d88e2b2b8eff4eda98d25ae0922bc07199a69c7
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/5720
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
diff --git a/examples/CppHelloTriangle.cpp b/examples/CppHelloTriangle.cpp
index 1c703af..f13d0ba 100644
--- a/examples/CppHelloTriangle.cpp
+++ b/examples/CppHelloTriangle.cpp
@@ -153,7 +153,7 @@
     utils::ComboRenderPassDescriptor renderPass({backbuffer.CreateDefaultTextureView()},
                                                 depthStencilView);
 
-    static const uint32_t vertexBufferOffsets[1] = {0};
+    static const uint64_t vertexBufferOffsets[1] = {0};
     dawn::CommandEncoder encoder = device.CreateCommandEncoder();
     {
         dawn::RenderPassEncoder pass = encoder.BeginRenderPass(&renderPass);