Reduce calling SendProfile to long running commands. There's lots of low hanging fruit (slow commands) to optimize before we need perf stats from fast commands.

R=maruel@chromium.org
BUG=

Review URL: https://chromiumcodereview.appspot.com/11416230

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@170009 0039d316-1c4b-4281-b951-d872f2087c98