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 90e7ecd5f7852e2b95e173505cbf1ef5b167de4b..9cac362edffbfccc97d764752a1a12a9a0928548 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;
 }
@@ -270,6 +268,10 @@ class AutofillManager : public AutofillDownloadManager::Observer,
     return &form_structures_;
   }
 
+  AutofillMetrics::FormInteractionsUkmLogger* form_interactions_ukm_logger() {
+    return form_interactions_ukm_logger_.get();
+  }
+
   // Exposed for testing.
   AutofillExternalDelegate* external_delegate() {
     return external_delegate_;
@@ -510,6 +512,10 @@ 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>
@@ -595,6 +601,7 @@ class AutofillManager : public AutofillDownloadManager::Observer,
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, AddressSubmittedFormEvents);
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, AddressWillSubmitFormEvents);
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, AddressSuggestionsCount);
+  FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, AutofillFormSubmittedState);
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, AutofillIsEnabledAtPageLoad);
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, CreditCardSelectedFormEvents);
   FRIEND_TEST_ALL_PREFIXES(AutofillMetricsTest, CreditCardFilledFormEvents);