Checkpoint web parity through Chromium input tasks

web/app/src/testing/script-sandbox-dispose.ts

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+export const SCRIPT_SANDBOX_DISPOSE_SCHEMA = 1 as const;
+
+export interface ScriptSandboxDisposeReceipt {
+  schemaVersion: typeof SCRIPT_SANDBOX_DISPOSE_SCHEMA;
+  disposeCount: number;
+  idempotent: boolean;
+  resources: {
+    messagePorts: 0;
+    timers: 0;
+    abortControllers: 0;
+    transferableBuffers: 0;
+    pendingRequests: 0;
+    cacheReferences: 0;
+  };
+  lateTimerMessages: 0;
+}
+
+export function createScriptSandboxDisposeReceipt(disposeCount: number): ScriptSandboxDisposeReceipt {
+  if (!Number.isSafeInteger(disposeCount) || disposeCount < 1) throw new Error("SCRIPT_SANDBOX_DISPOSE_INVALID: dispose count must be positive");
+  return {
+    schemaVersion: SCRIPT_SANDBOX_DISPOSE_SCHEMA,
+    disposeCount,
+    idempotent: disposeCount > 1,
+    resources: { messagePorts: 0, timers: 0, abortControllers: 0, transferableBuffers: 0, pendingRequests: 0, cacheReferences: 0 },
+    lateTimerMessages: 0,
+  };
+}