[mojo-edk] Expose notification source to MojoWatch callbacks

mojo/public/cpp/bindings/tests/binding_unittest.cc

Index: mojo/public/cpp/bindings/tests/binding_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/binding_unittest.cc b/mojo/public/cpp/bindings/tests/binding_unittest.cc
index 15b899de7828b705d73f9b0bee3cc9890dc370a6..054b36a9dbe8472e5d79daca438bd538dccacaf7 100644
--- a/mojo/public/cpp/bindings/tests/binding_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/binding_unittest.cc
@@ -311,6 +311,29 @@ TEST_F(BindingTest, ErrorHandleNotRunWhilePaused) {
   EXPECT_TRUE(called);
 }
 
+class SingleMethodImpl : public sample::SingleMethod {
+ public:
+  explicit SingleMethodImpl(const Closure& on_call) : on_call_(on_call) {}
+  ~SingleMethodImpl() override {}
+
+ private:
+  // sample::SingleMethod:
+  void Call() override { on_call_.Run(); }
+
+  const Closure on_call_;
+};
+
+// Tests that sync dispatch works when enabled on a Binding.
+TEST_F(BindingTest, SyncDispatch) {
+  bool called = false;
+  sample::SingleMethodPtr ptr;
+  SingleMethodImpl impl([&called] { called = true; });
+  Binding<sample::SingleMethod> binding(&impl, GetProxy(&ptr));
+  binding.EnableImmediateDispatchOfEventsFromSameThread(true);
+  ptr->Call();
+  EXPECT_TRUE(called);
+}
+
 // StrongBindingTest -----------------------------------------------------------
 
 using StrongBindingTest = BindingTestBase;