[Autofill] Log the number of autofill profiles available at form submission

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 0d0ac3903336366acecc5b2b2752fe3c108ee057..3dea42ee3356957992dd16782ce6ac960f1b0695 100644
--- a/components/autofill/core/browser/autofill_manager.cc
+++ b/components/autofill/core/browser/autofill_manager.cc
@@ -339,15 +339,20 @@ bool AutofillManager::OnFormSubmitted(const FormData& form,
   if (!FindCachedForm(form, &cached_submitted_form))
     return false;
 
+  const std::vector<AutofillProfile*>& profiles = personal_data_->GetProfiles();
+  const std::vector<CreditCard*>& credit_cards =
+      personal_data_->GetCreditCards();
+
   submitted_form->UpdateFromCache(*cached_submitted_form);
-  if (submitted_form->IsAutofillable())
+  if (submitted_form->IsAutofillable()) {
     ImportFormData(*submitted_form);
 
+    AutofillMetrics::LogNumberOfProfilesAtAutofillableFormSubmission(
+        profiles.size());
+  }
+
   // Only upload server statistics and UMA metrics if at least some local data
   // is available to use as a baseline.
-  const std::vector<AutofillProfile*>& profiles = personal_data_->GetProfiles();
-  const std::vector<CreditCard*>& credit_cards =
-      personal_data_->GetCreditCards();
   if (!profiles.empty() || !credit_cards.empty()) {
     // Copy the profile and credit card data, so that it can be accessed on a
     // separate thread.
@@ -507,7 +512,9 @@ void AutofillManager::OnQueryFormFieldAutofill(int query_id,
           RemoveDuplicateSuggestions(&suggestions);
 
         // The first time we show suggestions on this page, log the number of
-        // suggestions shown.
+        // suggestions available.
+        // TODO(mathp): Differentiate between number of suggestions available
+        // (current metric) and number shown to the user.
         if (!has_logged_address_suggestions_count_ && !section_is_autofilled) {
           AutofillMetrics::LogAddressSuggestionsCount(suggestions.size());
           has_logged_address_suggestions_count_ = true;