GCAPI should append to the existing experiment_labels instead of clobbering them.

chrome/common/metrics/variations/variations_util.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/common/metrics/variations/variations_util.h"
 
 #include <vector>
 
-#include "base/strings/string16.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/strings/string_split.h"
-#include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/child_process_logging.h"
-#include "chrome/installer/util/google_update_experiment_util.h"
 
 namespace chrome_variations {
 
 namespace {
 
-const char kVariationPrefix[] = "CrVar";
-const char kExperimentLabelSep[] = ";";
-
 // Populates |name_group_ids| based on |active_groups|.
 void GetFieldTrialActiveGroupIdsForActiveGroups(
     const base::FieldTrial::ActiveGroups& active_groups,
     std::vector<ActiveGroupId>* name_group_ids) {
   DCHECK(name_group_ids->empty());
   for (base::FieldTrial::ActiveGroups::const_iterator it =
        active_groups.begin(); it != active_groups.end(); ++it) {
     name_group_ids->push_back(MakeActiveGroupId(it->trial_name,
                                                 it->group_name));
   }
 }
 
-// This method builds a single experiment label for a Chrome Variation,
-// including a timestamp that is a year in the future from now. Since multiple
-// headers can be transmitted, |count| is a number that is appended after the
-// label key to differentiate the labels.
-string16 CreateSingleExperimentLabel(int count, VariationID id) {
-  // Build the parts separately so they can be validated.
-  const string16 key =
-      ASCIIToUTF16(kVariationPrefix) + base::IntToString16(count);
-  DCHECK_LE(key.size(), 8U);
-  const string16 value = base::IntToString16(id);
-  DCHECK_LE(value.size(), 8U);
-  string16 label(key);
-  label += ASCIIToUTF16("=");
-  label += value;
-  label += ASCIIToUTF16("|");
-  label += installer::BuildExperimentDateString();
-  return label;
-}
-
 }  // namespace
 
 void GetFieldTrialActiveGroupIds(
     std::vector<ActiveGroupId>* name_group_ids) {
   DCHECK(name_group_ids->empty());
   // A note on thread safety: Since GetActiveFieldTrialGroups() is thread
   // safe, and we operate on a separate list of that data, this function is
   // technically thread safe as well, with respect to the FieldTriaList data.
   base::FieldTrial::ActiveGroups active_groups;
   base::FieldTrialList::GetActiveFieldTrialGroups(&active_groups);
@@ skipping 30 matching lines @@
   if (!current_chunk.empty())
     chunks->push_back(current_chunk);
 }
 
 void SetChildProcessLoggingVariationList() {
   std::vector<string16> experiment_strings;
   GetFieldTrialActiveGroupIdsAsStrings(&experiment_strings);
   child_process_logging::SetExperimentList(experiment_strings);
 }
 
-string16 BuildGoogleUpdateExperimentLabel(
-    const base::FieldTrial::ActiveGroups& active_groups) {
-  string16 experiment_labels;
-  int counter = 0;
-
-  // Find all currently active VariationIDs associated with Google Update.
-  for (base::FieldTrial::ActiveGroups::const_iterator it =
-       active_groups.begin(); it != active_groups.end(); ++it) {
-    const VariationID id = GetGoogleVariationID(GOOGLE_UPDATE_SERVICE,
-                                                it->trial_name, it->group_name);
-
-    if (id == EMPTY_ID)
-      continue;
-
-    if (!experiment_labels.empty())
-      experiment_labels += ASCIIToUTF16(kExperimentLabelSep);
-    experiment_labels += CreateSingleExperimentLabel(++counter, id);
-  }
-
-  return experiment_labels;
-}
-
-string16 ExtractNonVariationLabels(const string16& labels) {
-  const string16 separator = ASCIIToUTF16(kExperimentLabelSep);
-  string16 non_variation_labels;
-
-  // First, split everything by the label separator.
-  std::vector<string16> entries;
-  base::SplitStringUsingSubstr(labels, separator, &entries);
-
-  // For each label, keep the ones that do not look like a Variations label.
-  for (std::vector<string16>::const_iterator it = entries.begin();
-       it != entries.end(); ++it) {
-    if (it->empty() || StartsWith(*it, ASCIIToUTF16(kVariationPrefix), false))
-      continue;
-
-    // Dump the whole thing, including the timestamp.
-    if (!non_variation_labels.empty())
-      non_variation_labels += separator;
-    non_variation_labels += *it;
-  }
-
-  return non_variation_labels;
-}
-
-string16 CombineExperimentLabels(const string16& variation_labels,
-                                 const string16& other_labels) {
-  const string16 separator = ASCIIToUTF16(kExperimentLabelSep);
-  DCHECK(!StartsWith(variation_labels, separator, false));
-  DCHECK(!EndsWith(variation_labels, separator, false));
-  DCHECK(!StartsWith(other_labels, separator, false));
-  DCHECK(!EndsWith(other_labels, separator, false));
-  // Note that if either label is empty, a separator is not necessary.
-  string16 combined_labels = other_labels;
-  if (!other_labels.empty() && !variation_labels.empty())
-    combined_labels += separator;
-  combined_labels += variation_labels;
-  return combined_labels;
-}
-
 // Functions below are exposed for testing explicitly behind this namespace.
 // They simply wrap existing functions in this file.
 namespace testing {
 
 void TestGetFieldTrialActiveGroupIds(
     const base::FieldTrial::ActiveGroups& active_groups,
     std::vector<ActiveGroupId>* name_group_ids) {
   GetFieldTrialActiveGroupIdsForActiveGroups(active_groups,
                                              name_group_ids);
 }
 
 }  // namespace testing
 
 }  // namespace chrome_variations