[Mac][Material Design] Adjust cutoff for detecting a "dark" theme.

[Mac][Material Design] Adjust cutoff for detecting a "dark" theme.

Chrome looks at the whiteComponent of a theme's custom toolbar color to
decide if the theme is "dark." The line between ligth and dark is an
empirical value - this cl adjusts the cutoff in hopes of getting closer
to the right value.

R=tapted@chromium.org
BUG=614806, 617993
Review-Url: https://codereview.chromium.org/2068243002
Cr-Commit-Position: refs/heads/master@{#400168}
(cherry picked from commit f4acec7a4f8fe1e3e50785a7a601499c2f7619b5)

Committed: https://chromium.googlesource.com/chromium/src/+/75175ca5f6abba3c5d15cbbc1080ce8f5889a946

[shrike, 2016-06-17 22:13:29]

Description was changed from

==========
[Mac][Material Design] Adjust cutoff for detecting a "dark" theme.

Chrome looks at the whiteComponent of a theme's custom toolbar color to
decide if the theme is "dark." The line between ligth and dark is an
empirical value - this cl adjusts the cutoff in hopes of getting closer
to the right value.

R=tapted@chromium.org
BUG=614806,617993

Review-Url: https://codereview.chromium.org/2068243002
Cr-Commit-Position: refs/heads/master@{#400168}
(cherry picked from commit f4acec7a4f8fe1e3e50785a7a601499c2f7619b5)
==========

to

==========
[Mac][Material Design] Adjust cutoff for detecting a "dark" theme.

Chrome looks at the whiteComponent of a theme's custom toolbar color to
decide if the theme is "dark." The line between ligth and dark is an
empirical value - this cl adjusts the cutoff in hopes of getting closer
to the right value.

R=tapted@chromium.org
BUG=614806,617993

Review-Url: https://codereview.chromium.org/2068243002
Cr-Commit-Position: refs/heads/master@{#400168}
(cherry picked from commit f4acec7a4f8fe1e3e50785a7a601499c2f7619b5)

Committed:
https://chromium.googlesource.com/chromium/src/+/75175ca5f6abba3c5d15cbbc1080...
==========

[shrike, 2016-06-17 22:13:31]

Committed patchset #1 (id:1) manually as
75175ca5f6abba3c5d15cbbc1080ce8f5889a946.