This CL adds a helper class for commonly used
helper methods inside web components, decreasing
the amount of duplicated code across the app.

Bug: v8:10667, v8:10644

Change-Id: I754396a9b3598d0930a82fc487857e946bfd3805
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2299359Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Commit-Queue: Zeynep Cankara <zcankara@google.com>
Cr-Commit-Position: refs/heads/master@{#68899}