WebUI: Add TypeScript @types package for OffscreenCanvas

Specifically, this adds @types/offscreencanvas as dependency.

Also updates npm_include to have the .d.ts in those packages to be
actually included in the packed node_modules.tar.gz.

The OffscreenCanvas type is removed from TypeScript lib.dom.d.ts in
version 4.4, so the new package is needed for the type of
OffscreenCanvas when upgrading TypeScript compiler to newest version.

This increases the uncompressed node_modules size by about 4k.

Bug: b:213292127, 1285794
Test: compile chrome
Change-Id: I7decde4e775cb08db4e787a8050f3653f1f5eefc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3412318
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Pi-Hsun Shih <pihsun@chromium.org>
Auto-Submit: Pi-Hsun Shih <pihsun@chromium.org>
Cr-Commit-Position: refs/heads/main@{#963465}

third_party/node/README.chromium

@@ -127,6 +127,21 @@ Local Modifications:
 (none)
 
 
+Name: Type Definition for OffscreenCanvas
+Short Name: @types/offscreencanvas
+URL: https://www.npmjs.com/package/@types/offscreencanvas
+Version: 2019.6.4
+License: MIT
+Security Critical: No. The types are only used when type checking in Chrome OS.
+
+Description:
+This package contains type definitions for offscreencanvas-browser
+(https://html.spec.whatwg.org/multipage/canvas.html#the-offscreencanvas-interface).
+
+Local Modifications:
+(none)
+
+
 Name: ESLint JSDoc Plugin
 Short Name: eslint-plugin-jsdoc
 URL: https://www.npmjs.com/package/eslint-plugin-jsdoc

third_party/node/node_modules.tar.gz.sha1

@@ -1 +1 @@
-1291471c9ef3dd6fca73dda7b5d0eea1026da863
+2f33b35e626e95781b6d35ee6f36e0a26a6d8b30

third_party/node/npm_include.txt

@@ -4,6 +4,7 @@
 @types/google.analytics
 @types/google.analytics/*.d.ts
 @types/mocha/index.d.ts
+@types/offscreencanvas/index.d.ts
 @types/w3c-css-typed-object-model-level-1
 @types/w3c-css-typed-object-model-level-1/*.d.ts
 @types/w3c-image-capture

third_party/node/package.json

@@ -7,6 +7,7 @@
     "@types/dom-mediacapture-record": "1.0.10",
     "@types/google.analytics": "0.0.42",
     "@types/mocha": "9.0.0",
+    "@types/offscreencanvas": "2019.6.4",
     "@types/w3c-css-typed-object-model-level-1": "20180410.0.3",
     "@types/w3c-image-capture": "1.0.4",
     "@types/webrtc": "0.0.29",