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This CL writes field trial parameters into its allocated spot in shared memory. The format of the pickle should now look like:

TrialName
GroupName
ParamKey1
ParamValue1
ParamKey2
ParamValue2
...

BUG=660041

Review-Url: https://codereview.chromium.org/2463223002
Cr-Commit-Position: refs/heads/master@{#435615}