[gbb-cct] Add new XSurface APIs for Page Insights.

A following internal CL will use these APIs to implement rendering.

Bug: b/280428169
Change-Id: I55d22be518d830405f9515cb473f42f0a74bc5c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4548460


Reviewed-by: Dan H <harringtond@chromium.org>
Commit-Queue: Edmund Wright <edmundw@google.com>
Cr-Commit-Position: refs/heads/main@{#1146589}