Network connectivity - Added a new experiment to send 21 packets for packet loss test to determine the impact of sending extra packets on forward error correction.
Network connectivity - Added a new experiment to send 21 packets
for packet loss test to determine the impact of sending extra packets
on forward error correction.

- Added a histogram to collect stats on what is the probability of
a packet being lost (by counting how many times we have received n'th packet,
where n goes from 1 to 21).

- Added a new histogram to determine if we have received atleast one
  packet or not.

- Added histograms the counts the number of packets received from 0 to
  n when we we send n packets (where n goes from 1 to 21).

R=jar
TEST=browser unit tests

Review URL: https://chromiumcodereview.appspot.com/10442127

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@141430 0039d316-1c4b-4281-b951-d872f2087c98

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