UKM that threads together multiple form interaction events.

components/autofill/core/browser/autofill_manager.h

Index: components/autofill/core/browser/autofill_manager.h
diff --git a/components/autofill/core/browser/autofill_manager.h b/components/autofill/core/browser/autofill_manager.h
index e00a31b75692036c57bffa2a70459586e7766dd0..3894bc8f8dec6beec23d1c8987e040b16ae56941 100644
--- a/components/autofill/core/browser/autofill_manager.h
+++ b/components/autofill/core/browser/autofill_manager.h
@@ -43,8 +43,6 @@
 #define ENABLE_FORM_DEBUG_DUMP
 #endif
 
-class GURL;
-
 namespace gfx {
 class RectF;
 }
@@ -510,6 +508,10 @@ class AutofillManager : public AutofillDownloadManager::Observer,
   // Handles single-field autocomplete form data.
   std::unique_ptr<AutocompleteHistoryManager> autocomplete_history_manager_;
 
+  // Utility for logging URL keyed metrics.
+  std::unique_ptr<AutofillMetrics::FormInteractionsUkmLogger>
+      form_interactions_ukm_logger_;
+
   // Utilities for logging form events.
   std::unique_ptr<AutofillMetrics::FormEventLogger> address_form_event_logger_;
   std::unique_ptr<AutofillMetrics::FormEventLogger>