Implement onEvent callback framework for UDP

chrome/browser/extensions/api/socket/socket_api_controller.h

Index: chrome/browser/extensions/api/socket/socket_api_controller.h
diff --git a/chrome/browser/extensions/api/socket/socket_api_controller.h b/chrome/browser/extensions/api/socket/socket_api_controller.h
index ff50bc0b6e9accb0c28644259c7ee49f15b4a3c5..d2ae2633c2b3b4c61d61235aad0225e0c6fb1e92 100644
--- a/chrome/browser/extensions/api/socket/socket_api_controller.h
+++ b/chrome/browser/extensions/api/socket/socket_api_controller.h
@@ -28,6 +28,11 @@ class IPEndPoint;
 
 namespace extensions {
 
+// kSrcIdKey, or "srcId," binds a socket to the onEvent closure that was
+// optionally passed to the socket.create() method. It's generated by us in
+// schema_generated_bindings.js; the application code is unaware of it.
+extern const char kSrcIdKey[];
+
 class Socket;
 
 // SocketController keeps track of a collection of Sockets and provides a
@@ -43,7 +48,7 @@ class SocketController {
   // TODO(miket): aa's suggestion to track lifetime of callbacks associated
   // with each socket, which will then let us clean up when we go out of scope
   // rather than requiring that the app developer remember to call Destroy.
-  int CreateUdp(const Profile* profile, const std::string& extension_id,
+  int CreateUdp(Profile* profile, const std::string& extension_id, int src_id,
                 const GURL& src_url);
   bool DestroyUdp(int socket_id);