Add "previewing on hover" support for password field.

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 17ae4831fe58a5aec23fe2598aa329f18ea330f7..630f07bcdecac5324a494856ca2537a2166d39ca 100644
--- a/components/autofill/content/renderer/password_autofill_agent.h
+++ b/components/autofill/content/renderer/password_autofill_agent.h
@@ -38,9 +38,14 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   bool TextFieldHandlingKeyDown(const blink::WebInputElement& element,
                                 const blink::WebKeyboardEvent& event);
 
+  // Preview the password associated with user name |username|. Returns true if
+  // the username and password fields were previewed, false otherwise.
+  bool DidSelectSuggestion(const blink::WebNode& node,
+                                   const blink::WebString& username);
+
   // Fills the password associated with user name |username|. Returns true if
   // the username and password fields were filled, false otherwise.
-  bool DidAcceptAutofillSuggestion(const blink::WebNode& node,
+  bool DidAcceptSuggestion(const blink::WebNode& node,
                                    const blink::WebString& username);
   // A no-op.  Password forms are not previewed, so they do not need to be
   // cleared when the selection changes.  However, this method returns
@@ -49,6 +54,10 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
   // Shows an Autofill popup with username suggestions for |element|.
   // Returns true if any suggestions were shown, false otherwise.
   bool ShowSuggestions(const blink::WebInputElement& element);
+  // Return true if password was autofilled before previewing the form.
+  bool WasPasswordAutofilled();
+  // Return true if password is previewed.
+  bool IsPasswordPreviewed();
 
   // Called when new form controls are inserted.
   void OnDynamicFormsSeen(blink::WebFrame* frame);
@@ -146,7 +155,19 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
                                   blink::WebInputElement username_element,
                                   blink::WebInputElement password_element);
 
-  bool FillUserNameAndPassword(
+  void FindUserNameAndPassword(base::string16 current_username,
+                               base::string16* username,
+                               base::string16* password,
+                               const PasswordFormFillData& fill_data,
+                               bool exact_username_match);
+
+  bool FillUserNameAndPassword(blink::WebInputElement* username_element,
+                               blink::WebInputElement* password_element,
+                               const PasswordFormFillData& fill_data,
+                               bool exact_username_match,
+                               bool set_selection);
+
+  bool PreviewUserNameAndPassword(
       blink::WebInputElement* username_element,
       blink::WebInputElement* password_element,
       const PasswordFormFillData& fill_data,
@@ -189,6 +210,9 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
 
   PasswordValueGatekeeper gatekeeper_;
 
+  bool was_password_autofilled_;
+  bool is_password_previewed_;
+
   base::WeakPtrFactory<PasswordAutofillAgent> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordAutofillAgent);