chore(ext/webgpu): include GPUCanvasContext in snapshot (#21773)

Part 1 of #21713 

Changes:

- Remove `.present()` and add a `presentGPUCanvasContext` (not exposed
yet to users)
- Move lazy load logic to `00_init.js`. This can be used to use webgpu
on-demand from future code (OffScreenCanvas)

1 files changed, 39 insertions, 0 deletions

diff --git a/ext/webgpu/00_init.js b/ext/webgpu/00_init.js
new file mode 100644
index 000000000..b559fe3db
--- /dev/null
+++ b/ext/webgpu/00_init.js
@@ -0,0 +1,39 @@
+// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
+
+import { core } from "ext:core/mod.js";
+const ops = core.ops;
+
+let webgpu;
+
+function webGPUNonEnumerable(getter) {
+  let valueIsSet = false;
+  let value;
+
+  return {
+    get() {
+      loadWebGPU();
+
+      if (valueIsSet) {
+        return value;
+      } else {
+        return getter();
+      }
+    },
+    set(v) {
+      loadWebGPU();
+
+      valueIsSet = true;
+      value = v;
+    },
+    enumerable: false,
+    configurable: true,
+  };
+}
+
+function loadWebGPU() {
+  if (!webgpu) {
+    webgpu = ops.op_lazy_load_esm("ext:deno_webgpu/01_webgpu.js");
+  }
+}
+
+export { loadWebGPU, webgpu, webGPUNonEnumerable };