[iOS] Support for chrome://version

components/version_ui/version_handler_helper.cc

+// Copyright 2015 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 "components/version_ui/version_handler_helper.h"
+
+#include <vector>
+
+#include "base/metrics/field_trial.h"
+#include "base/strings/string_util.h"
+#include "base/values.h"
+#include "components/variations/active_field_trials.h"
+
+namespace version_ui {
+
+scoped_ptr<base::Value> GetVariationsList() {
+  std::vector<std::string> variations;
+#if !defined(NDEBUG)
+  base::FieldTrial::ActiveGroups active_groups;
+  base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
+
+  const unsigned char kNonBreakingHyphenUTF8[] = {0xE2, 0x80, 0x91, '\0'};
+  const std::string kNonBreakingHyphenUTF8String(
+      reinterpret_cast<const char*>(kNonBreakingHyphenUTF8));
+  for (const auto& group : active_groups) {
+    std::string line = group.trial_name + ":" + group.group_name;
+    base::ReplaceChars(line, "-", kNonBreakingHyphenUTF8String, &line);
+    variations.push_back(line);
+  }
+#else
+  // In release mode, display the hashes only.
+  variations::GetFieldTrialActiveGroupIdsAsStrings(&variations);
+#endif
+
+  scoped_ptr<base::ListValue> variations_list(new base::ListValue);
+  for (std::vector<std::string>::const_iterator it = variations.begin();
+       it != variations.end(); ++it) {
+    variations_list->Append(new base::StringValue(*it));
+  }
+
+  return variations_list.Pass();
+}
+
+}  // namespace version_ui