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There's special Mach port magic required to measure CPU on a process other than the current process. Since we want to measure both the renderer and browser process CPU we need to do this.

BUG=

Review URL: https://chromiumcodereview.appspot.com/24024003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@222045 0039d316-1c4b-4281-b951-d872f2087c98