Mojo: Add NotifyBadMessage API

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 6320365ec11a0a8b2a6334087d5b4ce366291ae2..3b0d923e485c6befa8a734064d7c6d3a17e69b75 100644
--- a/mojo/edk/embedder/embedder.cc
+++ b/mojo/edk/embedder/embedder.cc
@@ -44,9 +44,17 @@ void SetMaxMessageSize(size_t bytes) {
 void ChildProcessLaunched(base::ProcessHandle child_process,
                           ScopedPlatformHandle server_pipe,
                           const std::string& child_token) {
+  ChildProcessLaunched(
+      child_process, std::move(server_pipe), child_token, base::Closure());
+}
+
+void ChildProcessLaunched(base::ProcessHandle child_process,
+                          ScopedPlatformHandle server_pipe,
+                          const std::string& child_token,
+                          const base::Closure& bad_message_callback) {
   CHECK(internal::g_core);
   internal::g_core->AddChild(child_process, std::move(server_pipe),
-                             child_token);
+                             child_token, bad_message_callback);
 }
 
 void ChildProcessLaunchFailed(const std::string& child_token) {