Create variations target that depends on base.

components/variations/proto/study.proto

Index: components/variations/proto/study.proto
===================================================================
--- components/variations/proto/study.proto	(revision 0)
+++ components/variations/proto/study.proto	(working copy)
@@ -0,0 +1,162 @@
+// 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;
+}