Parametrize a variety of constants in preparation for changing them in MD.

Parametrize a variety of constants in preparation for changing them in MD.

Right now these constants are all set to their existing values in all modes, so
there should be no behavior change.  This will allow me to easily change their
values in the material design modes without having that change need to include
the boilerplate of parametrizing them.  (I already know from local work that
I'll need to change all these.)

This also cleans up the existing code in a few places.

BUG=505805
TEST=none

Committed: https://crrev.com/ba6a4101ba5ec284d79e9b3254addbd80e4ac48d
Cr-Commit-Position: refs/heads/master@{#349829}

[Peter Kasting, 2015-09-18 20:40:45]

pkasting@chromium.org changed reviewers:
+ sky@chromium.org

[Peter Kasting, 2015-09-18 20:40:46]

https://codereview.chromium.org/1355893002/diff/20001/chrome/browser/ui/views...
File chrome/browser/ui/views/tabs/tab_strip.h (left):

https://codereview.chromium.org/1355893002/diff/20001/chrome/browser/ui/views...
chrome/browser/ui/views/tabs/tab_strip.h:382: int GetTabOverlap() const;
Turns out I didn't need this after all -- the mechanism to look up a
parametrized constant got simplified after I added this.

[sky, 2015-09-18 20:51:10]

LGTM

[Peter Kasting, 2015-09-19 00:59:53]

The CQ bit was checked by pkasting@chromium.org

[commit-bot: I haz the power, 2015-09-19 00:59:59]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1355893002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1355893002/20001

[commit-bot: I haz the power, 2015-09-19 01:05:27]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-09-19 01:06:06]

Patchset 2 (id:??) landed as
https://crrev.com/ba6a4101ba5ec284d79e9b3254addbd80e4ac48d
Cr-Commit-Position: refs/heads/master@{#349829}