Add a mechanism to force parameters of a group to a specific value.

chrome/common/variations/variations_util.h

Index: chrome/common/variations/variations_util.h
diff --git a/chrome/common/variations/variations_util.h b/chrome/common/variations/variations_util.h
index 0d21c16a630902406cb91d1aa9b25fcd37cc8513..212569b023c15115d8740acc2e5609c8cf359449 100644
--- a/chrome/common/variations/variations_util.h
+++ b/chrome/common/variations/variations_util.h
@@ -5,12 +5,20 @@
 #ifndef CHROME_COMMON_VARIATIONS_VARIATIONS_UTIL_H_
 #define CHROME_COMMON_VARIATIONS_VARIATIONS_UTIL_H_
 
+#include <string>
+
 namespace chrome_variations {
 
 // Get the current set of chosen FieldTrial groups (aka variations) and send
 // them to the child process logging module so it can save it for crash dumps.
 void SetChildProcessLoggingVariationList();
 
+// Provides a mechanism to associate multiple set of params to multiple groups
+// with a formatted string specified from commandline. See
+// kForceFieldTrialParams in chrome/common/chrome_switches.cc for more details
+// on the formatting.
+bool AssociateParamsFromString(const std::string& variations_string);
+
 }  // namespace chrome_variations
 
 #endif  // CHROME_COMMON_VARIATIONS_VARIATIONS_UTIL_H_