Add "previewing on hover" support for password field.

components/autofill/content/renderer/form_autofill_util.cc

Index: components/autofill/content/renderer/form_autofill_util.cc
diff --git a/components/autofill/content/renderer/form_autofill_util.cc b/components/autofill/content/renderer/form_autofill_util.cc
index 965f7f6695f207a83e232c23810bbaaa0875a75e..5ddf212f1ba26c36e0d20b264fd77369cee56d90 100644
--- a/components/autofill/content/renderer/form_autofill_util.cc
+++ b/components/autofill/content/renderer/form_autofill_util.cc
@@ -1045,14 +1045,14 @@ void PreviewForm(const FormData& form, const WebFormControlElement& element) {
 }
 
 bool ClearPreviewedFormWithElement(const WebFormControlElement& element,
-                                   bool was_autofilled) {
+                                   bool was_autofilled,
+                                   bool was_password_autofilled) {
   WebFormElement form_element = element.form();
   if (form_element.isNull())
     return false;
 
   std::vector<WebFormControlElement> control_elements;
-  ExtractAutofillableElements(form_element, REQUIRE_AUTOCOMPLETE,
-                              &control_elements);
+  ExtractAutofillableElements(form_element, REQUIRE_NONE, &control_elements);
   for (size_t i = 0; i < control_elements.size(); ++i) {
     // There might be unrelated elements in this form which have already been
     // auto-filled.  For example, the user might have already filled the address
@@ -1093,6 +1093,8 @@ bool ClearPreviewedFormWithElement(const WebFormControlElement& element,
         // cursor.
         int length = control_element.value().length();
         control_element.setSelectionRange(length, length);
+      } else if (input_element->isPasswordField()) {
+        input_element->setAutofilled(was_password_autofilled);
       } else {
         control_element.setAutofilled(false);
       }