[mojo-edk] Expose notification source to MojoWatch callbacks

mojo/edk/system/core.cc

Index: mojo/edk/system/core.cc
diff --git a/mojo/edk/system/core.cc b/mojo/edk/system/core.cc
index d43630711c5bfa9cf561668af5104c2ef0731803..d6f10b9bb07e55917352859275cb4e545df5904e 100644
--- a/mojo/edk/system/core.cc
+++ b/mojo/edk/system/core.cc
@@ -51,9 +51,10 @@ const uint64_t kUnknownPipeIdForDebug = 0x7f7f7f7f7f7f7f7fUL;
 void CallWatchCallback(MojoWatchCallback callback,
                        uintptr_t context,
                        MojoResult result,
-                       const HandleSignalsState& signals_state) {
-  callback(context, result,
-           static_cast<MojoHandleSignalsState>(signals_state));
+                       const HandleSignalsState& signals_state,
+                       MojoWatchNotificationFlags flags) {
+  callback(context, result, static_cast<MojoHandleSignalsState>(signals_state),
+      flags);
 }
 
 }  // namespace