GitLab

The current logic use background color for tab color in a tabbed PWA.
So the current logic ignores any dynamic changes to bg for non-tabbed
apps.

But bg color also sets other things such as download shelf color,
so we should still update themes for non-tabbed apps when bg color
changes.

Moved color change detection logic for theme_color / background_color,
and UserChangedTheme notifications into UpdateThemePack to simplify
its callsites.

Bug: 1134112
Change-Id: Ibe68911b733b0eb7760cd2d2f4be96e3eb2c7a3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2451989Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814569}