Update contrast ratio on the IconLabelBubbleView separator.

This was originally written in https://codereview.chromium.org/1998493002/ to
implement the spec at
https://drive.google.com/corp/drive/folders/0B6Wxmj9LZL6XZjJURlVaN1hUTzQ .  The
spec produced contrast ratios for the separator of 2.44 in normal and 3.69 in
incognito.

Over time the behavior diverged, primarily since the incognito omnibox
background color changed.  The current omnibox ratio is 7.39.

The new code produces ratios of 2.42 in normal and 3.11 in incognito, similar to
the original behavior, but bringing incognito closer to normal (presuming that
the old normal behavior was the "gold standard" design-wise).

The primary motivation here, though, was to unify handling of light and dark so
the code didn't "toggle", but simply behaved consistently for all inputs.

Bug: 659451
Change-Id: Ic33c506e46864389bed8285f5cfbf439915b5222
Reviewed-on: https://chromium-review.googlesource.com/c/1411926
Reviewed-by: Evan Stade <estade@chromium.org>
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623030}
1 file changed