Generate passwords only for forms that autofill server marks as account creation forms.

components/autofill/core/browser/autofill_manager_delegate.h

Index: components/autofill/core/browser/autofill_manager_delegate.h
diff --git a/components/autofill/core/browser/autofill_manager_delegate.h b/components/autofill/core/browser/autofill_manager_delegate.h
index ceabc11e8d31657d1a05420f5387258d54f48ea3..275fc911ee0e5d64187d9525881d1299e475fcf3 100644
--- a/components/autofill/core/browser/autofill_manager_delegate.h
+++ b/components/autofill/core/browser/autofill_manager_delegate.h
@@ -95,6 +95,11 @@ class AutofillManagerDelegate {
 
   // Whether the Autocomplete feature of Autofill should be enabled.
   virtual bool IsAutocompleteEnabled() = 0;
+
+  // Pass the form structures to the password generation manager to detect
+  // account creation forms.
+  virtual void DetectAccountCreationForms(
+      const std::vector<autofill::FormStructure*>& forms) = 0;
 };
 
 }  // namespace autofill