Tweak layout for Chrome

examples/hello_world/chrome/index.js

@@ -0,0 +1,11 @@
+// Note that unlike the directory above this we don't need to use an
+// asynchronous `import` statement as we're just working with JS here so we can
+// use normal `import { ... }` statements.
+//
+// Unlike before however we have to *also* import the JS file itself containing
+// wasm (generated by wasm2es6js) which has a `booted` promise to let us know
+// when it's ready to go.
+import { greet } from './hello_world';
+import { booted } from './hello_world_wasm';
+
+booted.then(() => greet("World!"));