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Most of our existing disk cache histograms focus on the speed of operations on the cache itself. This CL adds a bunch that break down http transactions by type, and track both time spent reading (either from disk cache or network), and time spent waiting for the disk cache to allow us to send the network request.

Note that these patches are based on http://codereview.chromium.org/10797042/ , which must land first.

R=rvargas@chromium.org, tburkhard@chromium.org
BUG=None

Review URL: https://chromiumcodereview.appspot.com/10808047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150902 0039d316-1c4b-4281-b951-d872f2087c98