[Mac] Add field trial tuples to breakpad crash reports.

chrome/common/metrics/experiments_helper.h

 // 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_EXPERIMENTS_HELPER_H_
 #define CHROME_COMMON_METRICS_EXPERIMENTS_HELPER_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/metrics/field_trial.h"
+#include "base/string16.h"
 #include "chrome/common/metrics/variation_ids.h"
 
 // This namespace provides various helpers that extend the functionality around
 // base::FieldTrial.
 //
 // This includes a simple API used to handle getting and setting
 // data related to Google-specific experiments in the browser. This is meant to
 // be an extension to the base::FieldTrial for Google-specific functionality.
 //
 // These calls are meant to be made directly after appending all your groups to
@@ skipping 71 matching lines @@
 
 // Retrieve the chrome_variations::ID associated with a FieldTrial group. The
 // group is denoted by |trial_name| and |group_name|. This will return
 // chrome_variations::kEmptyID if there is currently no associated ID for the
 // named group. This API can be nicely combined with
 // FieldTrial::GetFieldTrialSelectedGroupIds to enumerate the
 // variation IDs for all active FieldTrial groups.
 chrome_variations::ID GetGoogleVariationID(const std::string& trial_name,
                                            const std::string& group_name);
 
+// Generates experiment chunks from |experiment_strings| that are suitable for
+// crash reporting.
+void GenerateExperimentChunks(const std::vector<string16>& experiment_strings,
+                              std::vector<string16>* chunks);
+
 // Get the current set of chosen FieldTrial groups (aka experiments) and send
 // them to the child process logging module so it can save it for crash dumps.
 void SetChildProcessLoggingExperimentList();
 
 }  // namespace experiments_helper
 
 // Expose some functions for testing. These functions just wrap functionality
 // that is implemented above.
 namespace testing {
 
 void TestGetFieldTrialSelectedGroupIdsForSelectedGroups(
     const base::FieldTrial::SelectedGroups& selected_groups,
     std::vector<experiments_helper::SelectedGroupId>* name_group_ids);
 
 uint32 TestHashName(const std::string& name);
 
-}
+}  // namespace testing
 
 #endif  // CHROME_COMMON_METRICS_EXPERIMENTS_HELPER_H_