Adds UKM for autofill attributes in form_structure.

components/autofill/core/browser/autofill_manager.cc

Index: components/autofill/core/browser/autofill_manager.cc
diff --git a/components/autofill/core/browser/autofill_manager.cc b/components/autofill/core/browser/autofill_manager.cc
index b13144267eba9f4eb0b2b5d39b280df0a5604bd8..c2d31b1b771743f16baab3e92e2d0123e71c4620 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -1924,7 +1924,9 @@ bool AutofillManager::ParseForm(const FormData& form,
   // as long as receivers don't take ownership.
   form_structures_.push_back(std::move(form_structure));
   *parsed_form_structure = form_structures_.back().get();
-  (*parsed_form_structure)->DetermineHeuristicTypes();
+  (*parsed_form_structure)
+      ->DetermineHeuristicTypes(client_->GetUkmService(),
+                                pending_upload_request_url_);

[Mathieu, 2017/03/27 18:58:55]

FormStructure::source_url is what you need, so can be internal?

[csashi, 2017/03/27 23:37:43]

Done.

   return true;
 }