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..20804da6af1607742705bf22e4ae060fbb1d29a6 100644
--- a/components/autofill/content/renderer/password_autofill_agent.h
+++ b/components/autofill/content/renderer/password_autofill_agent.h
@@ -38,6 +38,11 @@ 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 DidSelectAutofillSuggestion(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,
@@ -49,6 +54,8 @@ 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 preview the form.

[Ilya Sherman, 2014/03/21 22:35:19]

nit: "before preview" -> "before previewing"

[ziran.sun, 2014/03/25 18:25:26]

Done.

+  bool WasPasswordAutofilled();
 
   // Called when new form controls are inserted.
   void OnDynamicFormsSeen(blink::WebFrame* frame);
@@ -146,6 +153,11 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
                                   blink::WebInputElement username_element,
                                   blink::WebInputElement password_element);
 
+  std::vector<base::string16> FindUserNameAndPassword(
+      base::string16 current_username,
+      const PasswordFormFillData& fill_data,
+      bool exact_username_match);
+
   bool FillUserNameAndPassword(
       blink::WebInputElement* username_element,
       blink::WebInputElement* password_element,
@@ -153,6 +165,13 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
       bool exact_username_match,
       bool set_selection);
 
+  bool PreviewUserNameAndPassword(
+      blink::WebInputElement* username_element,
+      blink::WebInputElement* password_element,
+      const PasswordFormFillData& fill_data,
+      bool exact_username_match,
+      bool set_selection);
+
   // Fills |login_input| and |password| with the most relevant suggestion from
   // |fill_data| and shows a popup with other suggestions.
   void PerformInlineAutocomplete(
@@ -189,6 +208,8 @@ class PasswordAutofillAgent : public content::RenderViewObserver {
 
   PasswordValueGatekeeper gatekeeper_;
 
+  bool was_password_autofilled_;
+
   base::WeakPtrFactory<PasswordAutofillAgent> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PasswordAutofillAgent);