[Password Generation] Enable generation for dynamically created forms.

components/autofill/content/renderer/password_generation_agent.h

Index: components/autofill/content/renderer/password_generation_agent.h
diff --git a/components/autofill/content/renderer/password_generation_agent.h b/components/autofill/content/renderer/password_generation_agent.h
index ce85e7e49f7d2577e4ecc51a3aa28a9be04da15b..d0b7097cf5d07ec31389c9d3a1c7a6dac7ba5fed 100644
--- a/components/autofill/content/renderer/password_generation_agent.h
+++ b/components/autofill/content/renderer/password_generation_agent.h
@@ -39,6 +39,9 @@ class PasswordGenerationAgent : public content::RenderViewObserver {
   // Returns true if the newly focused node caused the generation UI to show.
   bool FocusedNodeHasChanged(const blink::WebNode& node);
 
+  // Called when new form controls are inserted.
+  void OnDynamicFormsSeen(blink::WebLocalFrame* frame);
+
   // The length that a password can be before the UI is hidden.
   static const size_t kMaximumOfferSize = 5;
 
@@ -64,6 +67,10 @@ class PasswordGenerationAgent : public content::RenderViewObserver {
   void OnAccountCreationFormsDetected(
       const std::vector<autofill::FormData>& forms);
 
+  // Helper function that will try and populate |password_elements_| and
+  // |possible_account_creation_form_|.
+  void FindPossibleGenerationForm(blink::WebLocalFrame* frame);
+
   // Helper function to decide if |passwords_| contains password fields for
   // an account creation form. Sets |generation_element_| to the field that
   // we want to trigger the generation UI on.