[Herb] Set up field trial for UI prototypes

chrome/browser/about_flags.cc

 // 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.
 
 #include "chrome/browser/about_flags.h"
 
 #include <iterator>
 #include <map>
 #include <set>
 #include <utility>
@@ skipping 510 matching lines @@
     {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
     {IDS_FLAGS_ENABLE_OFFLINE_PAGES_AS_BOOKMARKS,
      switches::kEnableOfflinePagesAsBookmarks, ""},
     {IDS_FLAGS_ENABLE_OFFLINE_PAGES_AS_SAVED_PAGES,
      switches::kEnableOfflinePagesAsSavedPages, ""},
     {IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, switches::kDisableOfflinePages,
      ""},
 };
 
 const FeatureEntry::Choice kHerbPrototypeChoices[] = {
-    {IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED, "", ""},
+    {IDS_GENERIC_EXPERIMENT_CHOICE_DEFAULT, "", ""},
+    {IDS_GENERIC_EXPERIMENT_CHOICE_DISABLED,
+     switches::kTabManagementExperimentType, "disabled"},

[Ted C, 2016/02/22 23:31:21]

I have a sinking suspicion that you need five distinct command lines so you can
use forcing_flag option in your server side configs.

Hopefully someone on the finch side can confirm that for us.

[gone, 2016/02/23 23:57:47]

Talked with Dan (and Alexei over chat), who confirmed that this is necessary.

     {IDS_FLAGS_HERB_PROTOTYPE_FLAVOR_ANISE,
      switches::kTabManagementExperimentType, "anise"},
     {IDS_FLAGS_HERB_PROTOTYPE_FLAVOR_BASIL,
      switches::kTabManagementExperimentType, "basil"},
     {IDS_FLAGS_HERB_PROTOTYPE_FLAVOR_CHIVE,
      switches::kTabManagementExperimentType, "chive"},
     {IDS_FLAGS_HERB_PROTOTYPE_FLAVOR_DILL,
      switches::kTabManagementExperimentType, "dill"},
 };
 #endif  // defined(OS_ANDROID)
@@ skipping 1494 matching lines @@
 const base::HistogramBase::Sample kBadSwitchFormatHistogramId = 0;
 
 const FeatureEntry* GetFeatureEntries(size_t* count) {
   *count = arraysize(kFeatureEntries);
   return kFeatureEntries;
 }
 
 }  // namespace testing
 
 }  // namespace about_flags