Refactor Autofill for out of process iframes (OOPIF).

components/autofill/content/common/autofill_messages.h

Index: components/autofill/content/common/autofill_messages.h
diff --git a/components/autofill/content/common/autofill_messages.h b/components/autofill/content/common/autofill_messages.h
index cd5cd1ed997d21daf075910b4996c368499f8b5e..916d99b5d5d938313c5a87ab0c958035271884e8 100644
--- a/components/autofill/content/common/autofill_messages.h
+++ b/components/autofill/content/common/autofill_messages.h
@@ -100,6 +100,10 @@ IPC_ENUM_TRAITS_MAX_VALUE(
 
 // Autofill messages sent from the browser to the renderer.
 
+// Tells the render frame that a user gesture was observed somewhere in the tab
+// (including in a different frame).
+IPC_MESSAGE_ROUTED0(AutofillMsg_FirstUserGestureObservedInTab)
+
 // Instructs the renderer to immediately return an IPC acknowledging the ping.
 // This is used to correctly sequence events, since IPCs are guaranteed to be
 // processed in order.
@@ -192,6 +196,9 @@ IPC_MESSAGE_ROUTED1(AutofillMsg_AccountCreationFormsDetected,
 // TODO(creis): check in the browser that the renderer actually has permission
 // for the URL to avoid compromised renderers talking to the browser.
 
+// Notification that there has been a user gesture.
+IPC_MESSAGE_ROUTED0(AutofillHostMsg_FirstUserGestureObserved)
+
 // Notification that forms have been seen that are candidates for
 // filling/submitting by the AutofillManager.
 IPC_MESSAGE_ROUTED2(AutofillHostMsg_FormsSeen,