Simplify and remove redundant code about paint debug info

- Move the check for
  RuntimeEnabledFeatures::PaintUnderInvalidationCheckingEnabled
  from LocalFrameView::PaintDebugInfoEnabled() into
  UpdatePaintDebugInfoEnabled() (renamed from
  UpdateLayerDebugInfoEnabled() for consistency).

- Remove redundant calls to PaintController::RecordDebugInfo()
  and make the function private.

Change-Id: I6145849aa742b9b0ff0add47b2916128e30a7031
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4762864
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1181251}