EDK: Add Core::GetRights().

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 65eb0733836af90e4935dcda1261fbfd74421d1e..f1c869f19e60f4232939bba869e55658d2dec2ce 100644
--- a/mojo/edk/system/core.cc
+++ b/mojo/edk/system/core.cc
@@ -175,6 +175,17 @@ MojoResult Core::Close(MojoHandle handle) {
   return h.dispatcher->Close();
 }
 
+MojoResult Core::GetRights(MojoHandle handle,
+                           UserPointer<MojoHandleRights> rights) {
+  Handle h;
+  MojoResult result = GetHandle(handle, &h);
+  if (result != MOJO_RESULT_OK)
+    return result;
+
+  rights.Put(h.rights);
+  return MOJO_RESULT_OK;
+}
+
 MojoResult Core::Wait(MojoHandle handle,
                       MojoHandleSignals signals,
                       MojoDeadline deadline,