ContentCapture: Support SVG text

This patch injects NodeHolder while paints SVG text.

Bug: 936994
Change-Id: I89c8ec86b2962c9c7093a799e24fd07e347e8624
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1498023
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: Tao Bai <michaelbai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#637440}
2 files changed