Tab audio indicator: Use animation container on Mac

Tab audio indicator: Use animation container on Mac

When showning an audio indicator on multiple tabs, the CPU usage on
my machine is:
  1 tab: 1.5%
  2 tab: 2.5%
  3 tab: 3.2%

This CL uses a common animation container for all tabs in a window.
This changes the CPU usage to:
  1 tab: 1.5%
  2 tab: 1.5%
  3 tab: 1.5%

BUG=3541
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=195059

[sail, 2013-04-16 20:45:17]

ping!

[Nico, 2013-04-16 23:23:12]

lgtm!

Now, what if one keeps youtube in a separate window?

[commit-bot: I haz the power, 2013-04-18 00:09:49]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sail@chromium.org/13867007/1

[commit-bot: I haz the power, 2013-04-18 00:12:26]

Step "update" is always a major failure.
Look at the try server FAQ for more details.
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win_rel&nu...

[commit-bot: I haz the power, 2013-04-18 20:03:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sail@chromium.org/13867007/1

[commit-bot: I haz the power, 2013-04-19 00:02:39]

Retried try job too often on win7_aura for step(s) browser_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=win7_aura&...

[commit-bot: I haz the power, 2013-04-19 00:43:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/sail@chromium.org/13867007/1

[commit-bot: I haz the power, 2013-04-19 03:07:42]

Change committed as 195059