Add more histograms to understand idle sockets. Add Net.SocketIdleTimeBeforeNextUse histograms to track how long a socket is idle before being requested again. Replace Net.SocketIdleTimeOnIOError with Net.SocketIdleTimeOnIOError2 which raises the sample max to 6 seconds and increases to 100 buckets.  I had incorrectly misread the code and assumed we closed idle sockets after 10 seconds.  We close idle sockets between 5 minutes and 5 minutes and 10 seconds of idle time.
Add more histograms to understand idle sockets.
Add Net.SocketIdleTimeBeforeNextUse histograms to track how long a socket is idle before being requested again.
Replace Net.SocketIdleTimeOnIOError with Net.SocketIdleTimeOnIOError2 which raises the sample max to 6 seconds and increases to 100 buckets.  I had incorrectly misread the code and assumed we closed idle sockets after 10 seconds.  We close idle sockets between 5 minutes and 5 minutes and 10 seconds of idle time.

Review URL: http://codereview.chromium.org/173256

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@24130 0039d316-1c4b-4281-b951-d872f2087c98

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