Added checking out of the chromiumos profile repository.
Added checking out of the chromiumos profile repository.

This repository stores .gcda files produced by Chrome when it runs PageCycler.
These profile files can then be fed in to do profile-guided optimization. During
my experiments PageCycler shows up to 22% performance improvement when these
files are used for PGO.

BUG=none
TEST=gclient sync && ls src/profile shows that the repo has been checked out.


Review URL: http://codereview.chromium.org/8991009

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@115851 0039d316-1c4b-4281-b951-d872f2087c98

adobe/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,gavinp/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,yitian134/chromium,ropik/chromium,gavinp/chromium,ropik/chromium,adobe/chromium,gavinp/chromium,ropik/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,yitian134/chromium,adobe/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,ropik/chromium,yitian134/chromium,yitian134/chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,adobe/chromium,adobe/chromium