Document the Combined Field Trial Testing Configuration Format

testing/variations/README

Index: testing/variations/README
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-Field Trial Testing Config
-==========================
-
-This directory contains field trial configurations that are used
-to ensure testing coverage of the experiments defined in the
-fieldtrial_testing_config_*.json files.
-
-The keys in these JSON files should match the Field Trial study name.
-The group names should match the experiment group names.
-
-Chrome features must be explicitly enabled using 'enable_features',
-as the variations framework does not actually fetch the Field Trial
-definitions.
-
-Field trial experiments specified in these configs are set to be
-enabled by default for Chromium builds. This configuration is also
-used for perf bots and browser tests in the waterfall.
-
-Note that these apply specifically for Chromium builds, and Chrome
-branded / official builds do not use these definitions.