Mojo: add support for disallowing sync calls for a process.

mojo/edk/embedder/embedder.cc

Index: mojo/edk/embedder/embedder.cc
diff --git a/mojo/edk/embedder/embedder.cc b/mojo/edk/embedder/embedder.cc
index 3b16d6e501bda9e237c496532ad8b56f7aff329d..bc4c03ef7a5c01e0d3f541ff4a05ca292871e767 100644
--- a/mojo/edk/embedder/embedder.cc
+++ b/mojo/edk/embedder/embedder.cc
@@ -172,5 +172,10 @@ std::string GenerateRandomToken() {
   return base::HexEncode(random_bytes, 16);
 }
 
+MojoResult SetProperty(MojoPropertyType type, const void* value) {
+  CHECK(internal::g_core);
+  return internal::g_core->SetProperty(type, value);
+}
+
 }  // namespace edk
 }  // namespace mojo