SuperSize: Fix up "Pro Tip" console log message

And add some color :)

Bug: None
Change-Id: I9c5be022139b4732572e16637ab7d29b0b22b36f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424826
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809796}

tools/binary_size/libsupersize/static/tree-ui.js

@@ -445,7 +445,9 @@ const newTreeElement = (() => {
         dom.replace(_symbolTree, rootElement);
         if (!_doneLoad && percent === 1) {
           _doneLoad = true;
-          console.log('Pro Tip: await worker.openNode("$FILE_PATH")')
+          console.log(
+              '%cPro Tip: %cawait supersize.worker.openNode("$FILE_PATH")',
+              'font-weight:bold; color: red;', '')
         }
       })
     );