Put each PeerConnection into a tab on webrtc-internals

Also collapse the stats tables by default to avoid spamming page with uninteresting stats.

A screenshot of the new layout:
https://chromium.googlecode.com/issues/attachment?aid=2446480001000&name=Screenshot+from+2013-11-06+11%3A57%3A55.png&token=NZG93vkzJxi_nPIPcE5GAq9_hfI%3A1383768028226&inline=1

BUG=244648

Review URL: https://codereview.chromium.org/26852007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233953 0039d316-1c4b-4281-b951-d872f2087c98
Blink roll 161620:161630

http://build.chromium.org/f/chromium/perf/dashboard/ui/changelog_blink.html?url=/trunk&range=161621:161630&mode=html
TBR=
BUG=

Review URL: https://codereview.chromium.org/67003002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233954 0039d316-1c4b-4281-b951-d872f2087c98
Update .DEPS.git

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233955 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233954
SVN changes up to revision 233955