Plumbing for variations headers from synthetic field trials.

components/variations/variations_associated_data.h

Index: components/variations/variations_associated_data.h
diff --git a/components/variations/variations_associated_data.h b/components/variations/variations_associated_data.h
index 8bacae1dda0e951b1bcd71e6106d75e1d6764707..3fe70f82785c87a036b577c006298c4376d7b41b 100644
--- a/components/variations/variations_associated_data.h
+++ b/components/variations/variations_associated_data.h
@@ -82,6 +82,11 @@ void AssociateGoogleVariationIDForce(IDCollectionKey key,
                                      const std::string& group_name,
                                      VariationID id);
 
+// As above, but takes an ActiveGroupId hash pair, rather than the string names.
+void AssociateGoogleVariationIDForceHashes(IDCollectionKey key,
+                                           const ActiveGroupId& active_group,
+                                           VariationID id);
+
 // Retrieve the variations::VariationID associated with a FieldTrial group for
 // collection |key|. The group is denoted by |trial_name| and |group_name|.
 // This will return variations::kEmptyID if there is currently no associated ID
@@ -92,6 +97,11 @@ VariationID GetGoogleVariationID(IDCollectionKey key,
                                  const std::string& trial_name,
                                  const std::string& group_name);
 
+// Same as GetGoogleVariationID(), but takes in a hashed |active_group| rather
+// than the string trial and group name.
+VariationID GetGoogleVariationIDFromHashes(IDCollectionKey key,
+                                           const ActiveGroupId& active_group);
+
 // Associates the specified set of key-value |params| with the variation
 // specified by |trial_name| and |group_name|. Fails and returns false if the
 // specified variation already has params associated with it or the field trial