Add Chromium-only Blender WebEngine parity work

tools/web/emscripten-env.sh

@@ -0,0 +1,28 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+WEB_EMSCRIPTEN_VERSION="3.1.69"
+web_workspace_root="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
+
+if command -v emcc >/dev/null 2>&1; then
+  detected_version="$(emcc --version | awk '{for (i = 1; i <= NF; i++) if ($i ~ /^[0-9]+\.[0-9]+\.[0-9]+$/) {print $i; exit}}')"
+  if [[ "${detected_version}" != "${WEB_EMSCRIPTEN_VERSION}" ]]; then
+    echo "Expected Emscripten ${WEB_EMSCRIPTEN_VERSION}, found ${detected_version}" >&2
+    exit 1
+  fi
+else
+  echo "emcc was not found; install or activate emsdk ${WEB_EMSCRIPTEN_VERSION}" >&2
+  exit 1
+fi
+
+export WEB_EMSCRIPTEN_VERSION
+export EM_CONFIG="${web_workspace_root}/.emscripten-web"
+export EM_CACHE="${web_workspace_root}/.emcache"
+export WEB_EMSCRIPTEN_CFLAGS="-sENVIRONMENT=web,worker -sMODULARIZE=1 -sEXPORT_ES6=1"
+export WEB_EMSCRIPTEN_LDFLAGS="-sALLOW_MEMORY_GROWTH=1 -sFILESYSTEM=1"
+
+if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
+  emcc --version | head -3
+  node --version
+  cmake --version | head -1
+fi