Suggest to fill password change forms

components/autofill/content/renderer/password_autofill_agent.h

Index: components/autofill/content/renderer/password_autofill_agent.h
diff --git a/components/autofill/content/renderer/password_autofill_agent.h b/components/autofill/content/renderer/password_autofill_agent.h
index f0f3267f9871b666b171f1284bd6ad621d0a6867..52808483533821767af128526da88de2691fb0a6 100644
--- a/components/autofill/content/renderer/password_autofill_agent.h
+++ b/components/autofill/content/renderer/password_autofill_agent.h
@@ -6,6 +6,7 @@
 #define COMPONENTS_AUTOFILL_CONTENT_RENDERER_PASSWORD_AUTOFILL_AGENT_H_
 
 #include <map>
+#include <set>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ -178,6 +179,7 @@ class PasswordAutofillAgent : public content::RenderFrameObserver {
                                 bool is_same_page_navigation) override;
   void WillSendSubmitEvent(const blink::WebFormElement& form) override;
   void WillSubmitForm(const blink::WebFormElement& form) override;
+  void FocusedNodeChanged(const blink::WebNode& node) override;
 
   // Legacy RenderViewObserver:
   void DidStartLoading();
@@ -270,6 +272,10 @@ class PasswordAutofillAgent : public content::RenderFrameObserver {
   std::map<const blink::WebInputElement, blink::WebString>
       nonscript_modified_values_;
 
+  // Contains all username fields that were in focus. It means that these fields
+  // are visible to the user.
+  std::set<const blink::WebInputElement> had_focus_username_fields_;
+
   PasswordValueGatekeeper gatekeeper_;
 
   // True indicates that user debug information should be logged.