GitLab

Adds service_sandbox_type.h header for components to consume and uses it
to supply sandbox type for PaintPreviewCompositorCollection.

Prelude to removal of WithSandboxType API. See linked bug for
rationale.  Does not change behavior.

Tests: browser_tests PaintPreviewCompositorBrowserTest.*
Bug: 1065087
Change-Id: Ie7e13e884df5c59edc850b3546d6d9b655102f79
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2202663Reviewed-by: Charlie Reis <creis@chromium.org>
Reviewed-by: Matthew Denton <mpdenton@chromium.org>
Reviewed-by: Ian Vollick <vollick@chromium.org>
Commit-Queue: Matthew Denton <mpdenton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772447}