Fix the "throb" animation for the immersive fullscreen light bars

Fix the "throb" animation for the immersive fullscreen light bars
- This CL darkens the light bars when they are throbbing. Previously, the light bars for inactive tabs would animate from 0 - 33% opacity.
- This CL ignores the mini tab title animation for immersive fullscreen tabs. Previously, the inactive mini tabs would be completely transparent while the animation was running.

BUG=265553
TEST=Manual, see bug
R=jamescook
TBR=sky

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=216774

[pkotwicz, 2013-08-08 00:33:02]

pkasting@, PTAL

[Peter Kasting, 2013-08-08 00:34:51]

I'm not familiar with any of this code.

[pkotwicz, 2013-08-08 00:42:33]

James, PTAL

I assume that I will only end up landing this change when sky@ gets back

[pkotwicz, 2013-08-08 01:23:47]

For the sake of interest, getting the light bars to throb:
- Open a whole bunch of tabs, highlight "Close other tabs" in the context menu
(Do not click!) Press F4 on the keyboard
- When a constrained window is opened in an inactive tab. (Note that not all
modal dialogs have this behavior) I was able to get this behavior via a
combination of window.print() and window.setInterval()

[James Cook, 2013-08-08 16:17:42]

LGTM

[James Cook, 2013-08-08 16:18:50]

On 2013/08/08 16:17:42, James Cook wrote:
> LGTM

Also, I think you could TBR this.

[commit-bot: I haz the power, 2013-08-09 15:51:15]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pkotwicz@chromium.org/22353017/11001

[commit-bot: I haz the power, 2013-08-09 23:19:58]

Change committed as 216774