and all child processes. Renderer processes also
use this new method to send histograms to browser.
This code is similar to the code that gets profiler
data from all processes.
R=jar@chromium.org,jam@chromium.org
TEST=browser unit tests, interactive UI tests
BUG=114013
Review URL: https://chromiumcodereview.appspot.com/10454086
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@146394 0039d316-1c4b-4281-b951-d872f2087c98
