Create variations target that depends on base.

chrome/browser/metrics/proto/study.proto

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-syntax = "proto2";
-
-option optimize_for = LITE_RUNTIME;
-
-package chrome_variations;
-
-// This defines the Protocol Buffer representation of a Chrome Variations study
-// as sent to clients of the Variations server.
-//
-// Next tag: 12
-message Study {
-  // The name of the study. Should not contain spaces or special characters.
-  // Ex: "my_study"
-  required string name = 1;
-
-  // The expiry date of the study in Unix time format. (Seconds since midnight
-  // January 1, 1970 UTC). See: http://en.wikipedia.org/wiki/Unix_time
-  //
-  // A study that has expired will be disabled, which will take precedence over
-  // a corresponding hardcoded field trial in the client.
-  //
-  // Ex: 1330893974  (corresponds to 2012-03-04 20:46:14Z)
-  optional int64 expiry_date = 3;
-
-  // Consistency setting for a study.
-  enum Consistency {
-    SESSION = 0;  // Can't change within a session.
-    PERMANENT = 1;  // Can't change for a given user.
-  }
-
-  // Consistency setting for this study. Optional - defaults to SESSION.
-  // Ex: PERMANENT
-  optional Consistency consistency = 7 [default = SESSION];
-
-  // Name of the experiment that gets the default experience. This experiment
-  // must be included in the list below.
-  // Ex: "default"
-  optional string default_experiment_name = 8;
-
-  // An experiment within the study.
-  //
-  // Next tag: 7
-  message Experiment {
-    // A named parameter value for this experiment.
-    //
-    // Next tag: 3
-    message Param {
-      // The name of the parameter.
-      optional string name = 1;
-
-      // The value of the parameter.
-      optional string value = 2;
-    }
-
-    // The name of the experiment within the study.
-    // Ex: "bucketA"
-    required string name = 1;
-
-    // The cut of the total probability taken for this experiment (the x in
-    // x / N, where N is the sum of all x’s).  Ex: "50"
-    required uint32 probability_weight = 2;
-
-    // Optional id used to uniquely identify this experiment for Google web
-    // properties.
-    optional uint64 google_web_experiment_id = 3;
-
-    // Optional id used to uniquely identify this experiment for Google Update.
-    optional uint64 google_update_experiment_id = 4;
-
-    // Optional name of a Chrome flag that, when present, causes this experiment
-    // to be forced. If the forcing_flag field is set, users will not be
-    // assigned to this experiment unless that flag is present in Chrome's
-    // command line.
-    optional string forcing_flag = 5;
-
-    // Parameter values for this experiment.
-    repeated Param param = 6; 
-  }
-
-  // List of experiments in this study. This list should include the default /
-  // control experiment.
-  //
-  // For example, to specify that 99% of users get the default behavior, while
-  // 0.5% of users get experience "A" and 0.5% of users get experience "B",
-  // specify the values below.
-  // Ex: { "default": 990, "A": 5, "B": 5 }
-  repeated Experiment experiment = 9;
-
-  // Possible Chrome release channels.
-  // See: http://dev.chromium.org/getting-involved/dev-channel
-  enum Channel {
-    // UNKNOWN value is defined here for the benefit of code using this enum
-    // type, but is not actually meant to be encoded in the protobuf.
-    UNKNOWN = -1;
-    CANARY = 0;
-    DEV = 1;
-    BETA = 2;
-    STABLE = 3;
-  }
-
-  // Possible Chrome operating system platforms.
-  enum Platform {
-    PLATFORM_WINDOWS  = 0;
-    PLATFORM_MAC      = 1;
-    PLATFORM_LINUX    = 2;
-    PLATFORM_CHROMEOS = 3;
-    PLATFORM_ANDROID  = 4;
-    PLATFORM_IOS      = 5;
-  }
-
-  // Filtering criteria specifying whether this study is applicable to a given
-  // Chrome instance.
-  //
-  // Next tag: 7
-  message Filter {
-    // The start date of the study in Unix time format. (Seconds since midnight
-    // January 1, 1970 UTC). See: http://en.wikipedia.org/wiki/Unix_time
-    // Ex: 1330893974  (corresponds to 2012-03-04 20:46:14Z)
-    optional int64 start_date = 1;
-
-    // The minimum Chrome version for this study, allowing a trailing '*'
-    // character for pattern matching. Inclusive. (To check for a match, iterate
-    // over each component checking >= until a * or end of string is reached.)
-    // Optional - if not specified, there is no minimum version.
-    // Ex: "17.0.963.46", "17.0.963.*", "17.*"
-    optional string min_version = 2;
-
-    // The maximum Chrome version for this study; same formatting as
-    // |min_version| above. Inclusive. (To check for a match, iterate over each
-    // component checking <= until a * or end of string is reached.)
-    // Optional - if not specified, there is no maximum version.
-    // Ex: "19.*"
-    optional string max_version = 3;
-
-    // List of channels that will receive this study. If omitted, the study
-    // applies to all channels.
-    // Ex: [BETA, STABLE]
-    repeated Channel channel = 4;
-
-    // List of platforms that will receive this study. If omitted, the study
-    // applies to all platforms.
-    // Ex: [PLATFORM_WINDOWS, PLATFORM_MAC]
-    repeated Platform platform = 5;
-
-    // List of locales that will receive this study. If omitted, the study
-    // applies to all locales.
-    // Ex: ["en-US", "en-CA"]
-    repeated string locale = 6;
-  }
-
-  // Filtering criteria for this study. A study that is filtered out for a given
-  // client is equivalent to that study not being sent at all.
-  optional Filter filter = 10;
-
-  // Randomization seed to be used when |consistency| is set to PERMANENT. If
-  // not specified, randomization will be done using the trial name.
-  optional uint32 randomization_seed = 11;
-}