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If no valid Data Reduction Proxy configuration is available to the client,
then the client does not get the benefit of the Data Reduction Proxy during
the period when a configuration is being retrieved. This CL sets up a
configurable simulation where all requests will continue to go through the
Data Reduction Proxy, but if the request is initiated during a period when
the client would request a configuration from the service, we will record
the reduction statistics to determine the overall effect on data compression.

BUG=484864

Review URL: https://codereview.chromium.org/1127893002

Cr-Commit-Position: refs/heads/master@{#330133}