Add metrics to track Autofill "user happiness"

chrome/common/autofill_messages.h

Index: chrome/common/autofill_messages.h
diff --git a/chrome/common/autofill_messages.h b/chrome/common/autofill_messages.h
index a9750ef24b7d125d68eeae02cb008d8829879e0b..75cc2fb52bf5fa8d4bd02c0dcfb4b4d2588dadd7 100644
--- a/chrome/common/autofill_messages.h
+++ b/chrome/common/autofill_messages.h
@@ -107,6 +107,11 @@ IPC_MESSAGE_ROUTED1(AutofillHostMsg_PasswordFormsVisible,
 IPC_MESSAGE_ROUTED1(AutofillHostMsg_FormSubmitted,
                     webkit_glue::FormData /* form */)
 
+// Notification that a form field's value has changed.
+IPC_MESSAGE_ROUTED2(AutofillHostMsg_TextFieldDidChange,
+                    webkit_glue::FormData /* the form */,
+                    webkit_glue::FormField /* the form field */)
+
 // Queries the browser for Autofill suggestions for a form input field.
 IPC_MESSAGE_ROUTED3(AutofillHostMsg_QueryFormFieldAutofill,
                     int /* id of this message */,
@@ -114,7 +119,8 @@ IPC_MESSAGE_ROUTED3(AutofillHostMsg_QueryFormFieldAutofill,
                     webkit_glue::FormField /* the form field */)
 
 // Sent when the popup with Autofill suggestions for a form is shown.
-IPC_MESSAGE_ROUTED0(AutofillHostMsg_DidShowAutofillSuggestions)
+IPC_MESSAGE_ROUTED1(AutofillHostMsg_DidShowAutofillSuggestions,
+                    bool /* is this a new popup? */)
 
 // Instructs the browser to fill in the values for a form using Autofill
 // profile data.
@@ -124,7 +130,10 @@ IPC_MESSAGE_ROUTED4(AutofillHostMsg_FillAutofillFormData,
                     webkit_glue::FormField /* the form field  */,
                     int /* profile unique ID */)
 
-// Sent when a form is previewed or filled with Autofill suggestions.
+// Sent when a form is previewed with Autofill suggestions.
+IPC_MESSAGE_ROUTED0(AutofillHostMsg_DidPreviewAutofillFormData)
+
+// Sent when a form is filled with Autofill suggestions.
 IPC_MESSAGE_ROUTED0(AutofillHostMsg_DidFillAutofillFormData)
 
 // Instructs the browser to remove the specified Autocomplete entry from the