Handle kPausePostRequest in C++ debugger api implementation

runtime/vm/debugger_api_impl.cc

Index: runtime/vm/debugger_api_impl.cc
diff --git a/runtime/vm/debugger_api_impl.cc b/runtime/vm/debugger_api_impl.cc
index beb0155370c484a9da23348eb755e33cfa193e47..71610d2b096025e2f749f6df3df5575957372335 100644
--- a/runtime/vm/debugger_api_impl.cc
+++ b/runtime/vm/debugger_api_impl.cc
@@ -173,6 +173,8 @@ static void DebuggerEventHandler(ServiceEvent* event) {
     if (isolate_event_handler != NULL) {
       (*isolate_event_handler)(event->isolate_id(), kShutdown);
     }
+  } else if (event->kind() == ServiceEvent::kPausePostRequest) {
+    // Ignore.
   } else {
     UNIMPLEMENTED();
   }