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+// 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.
+
+#ifndef CHROME_COMMON_METRICS_VARIATIONS_VARIATION_IDS_H_
+#define CHROME_COMMON_METRICS_VARIATIONS_VARIATION_IDS_H_
+
+namespace chrome_variations {
+
+// A list of Chrome Variation IDs. These IDs are associated with FieldTrials
+// for re-identification and analysis on Google servers.
+// These enums are to be used with the experiments_helper ID associoation API.
+//
+// The IDs are defined as part of an enum to prevent re-use. When adding your
+// own IDs, please respect the reserved IDs of other groups, as well as the
+// global range of permitted values.
+//
+// When you want to create a FieldTrial that needs to be recognized by Google
+// properties, reserve an ID by declaring them below. Please start with the name
+// of the FieldTrial followed a short description.
+//
+// Ex:
+// // Name: Instant-Field-Trial
+// // The Omnibox Instant Trial.
+// kInstantTrialOn  = 3300123,
+// kInstantTrialOff = 3300124,
+//
+// If you programatically generate FieldTrials, you can still use a loop to
+// create your IDs. Just be sure to reserve the range of IDs here with a clear
+// comment.
+//
+// Ex:
+// // Name: UMA-Uniformity-Trial-5-Percent
+// // Range: 330000 - 3300099
+// // The 5% Uniformity Trial. This is a reserved range.
+// kUniformityTrial5PercentStart = 330000,
+// kUniformirtTrial5PercentEnd   = 330099,
+//
+// Anything within the range of a uint32 should be castable to an ID, but
+// please ensure that they are within the range of the min and max values.
+enum VariationID {
+  // Used to represent no associated Chrome variation ID.
+  kEmptyID = 0,
+
+  // The smallest possible Chrome Variation ID in the reserved range. The
+  // first 10,000 values are reserved for internal variations infrastructure
+  // use. Please do not use values in this range.
+  kMinimumID = 3300000,
+
+  // Name: UMA-Uniformity-Trial-1-Percent
+  // Range: 3300000 - 3300099
+  kUniformity1PercentBase   = kMinimumID,
+  kUniformity1PercentLimit  = kUniformity1PercentBase + 100,
+  // Name: UMA-Uniformity-Trial-5-Percent
+  // Range: 3300100 - 3300119
+  kUniformity5PercentBase   = kUniformity1PercentLimit,
+  kUniformity5PercentLimit  = kUniformity5PercentBase + 20,
+  // Name: UMA-Uniformity-Trial-10-Percent
+  // Range: 3300120 - 3300129
+  kUniformity10PercentBase  = kUniformity5PercentLimit,
+  kUniformity10PercentLimit = kUniformity10PercentBase + 10,
+  // Name: UMA-Uniformity-Trial-20-Percent
+  // Range: 3300130 - 3300134
+  kUniformity20PercentBase  = kUniformity10PercentLimit,
+  kUniformity20PercentLimit = kUniformity20PercentBase + 5,
+  // Name: UMA-Uniformity-Trial-50-Percent
+  // Range: 3300135 - 3300136
+  kUniformity50PercentBase  = kUniformity20PercentLimit,
+  kUniformity50PercentLimit = kUniformity50PercentBase + 2,
+
+  // Name: UMA-Dynamic-Binary-Uniformity-Trial
+  // The dynamic uniformity trial is only specified on the server, this is just
+  // to reserve the id.
+  kDynamicUniformityDefault = 3300137,
+  kDynamicUniformityGroup01 = 3300138,
+
+  // Name: UMA-Session-Randomized-Uniformity-Trial-5-Percent
+  // Range: 3300139 - 3300158
+  // A uniformity trial used to compare one-time-randomized and
+  // session-randomized FieldTrials.
+  kUniformitySessionRandomized5PercentBase  = 3300139,
+  kUniformitySessionRandomized5PercentLimit =
+      kUniformitySessionRandomized5PercentBase + 20,
+
+  kUniformityTrialsMax      = 3300158,
+
+  // Some values reserved for unit and integration tests.
+  kTestValueA = 3300200,
+  kTestValueB = 3300201,
+
+  // USABLE IDs BEGIN HERE.
+  //
+  // The smallest possible Chrome Variation ID for use in real FieldTrials. If
+  // you are defining variation IDs for your own FieldTrials, NEVER use a value
+  // lower than this.
+  kMinimumUserID = 3310000,
+
+  // Add new variation IDs below.
+
+  // Name: OmniboxSearchSuggest
+  // Range: 3310000 - 3310019
+  // Suggest (Autocomplete) field trial, 20 IDs.
+  kSuggestIDMin = 3310000,
+  kSuggestIDMax = 3310019,
+
+  // Instant field trial.
+  kInstantIDControl = 3310020,
+  kInstantIDSilent  = 3310021,
+  kInstantIDHidden  = 3310022,
+  kInstantIDSuggest = 3310023,
+  kInstantIDInstant = 3310024,
+
+  // USABLE IDs END HERE.
+  //
+  // The largest possible Chrome variation ID in the reserved range. When
+  // defining your variation IDs, DO NOT exceed this value.
+  kMaximumID = 3399999,
+};
+
+}  // namespace chrome_variations
+
+#endif  // CHROME_COMMON_METRICS_VARIATIONS_VARIATION_IDS_H_