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the packet loss rate is bad for multiple connections in a row.

+ max_number_of_lossy_connections: specifies the maximum number of
  connections with high packet loss in a row after which QUIC will be
  disabled.

+ packet_loss_threshold:  specifies packet loss rate in franction after
  which a connection is closed and is considered as a lossy connection.

QUIC changes to support this were checked in the following CL:
  https://codereview.chromium.org/1025573002/

R=rch@chromium.org

Review URL: https://codereview.chromium.org/1041953003

Cr-Commit-Position: refs/heads/master@{#322704}