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 374c105fd5dce8fd96a5d973e1e59953fcba6259..0cea2135d9b1b3fd39b958d8ec59e19eed1a3f93 100644
--- a/components/autofill/core/browser/autofill_manager_delegate.h
+++ b/components/autofill/core/browser/autofill_manager_delegate.h
@@ -142,6 +142,11 @@ class AutofillManagerDelegate {
   virtual void UpdateAutocheckoutStep(
       AutocheckoutStepType step_type,
       AutocheckoutStepStatus step_status) = 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