Add packages to optimize svgs dynamically

These packages will be used to dynamically optimize SVG images
during the build.

R=jacktfranklin@chromium.org

Bug: 1216402
Change-Id: I04e95aa7d79c9d67beaf8a7861182c52b16b7d0f
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2939992
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>
diff --git a/node_modules/css-tree/lib/syntax/index.js b/node_modules/css-tree/lib/syntax/index.js
new file mode 100644
index 0000000..065ea04
--- /dev/null
+++ b/node_modules/css-tree/lib/syntax/index.js
@@ -0,0 +1,21 @@
+function merge() {
+    var dest = {};
+
+    for (var i = 0; i < arguments.length; i++) {
+        var src = arguments[i];
+        for (var key in src) {
+            dest[key] = src[key];
+        }
+    }
+
+    return dest;
+}
+
+module.exports = require('./create').create(
+    merge(
+        require('./config/lexer'),
+        require('./config/parser'),
+        require('./config/walker')
+    )
+);
+module.exports.version = require('../../package.json').version;