mus: Introduce API for embedder to dispatch event to the embeded client.

mojo/public/cpp/bindings/lib/validation_errors.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 
 #include "base/strings/stringprintf.h"
 #include "mojo/public/cpp/bindings/message.h"
 
 namespace mojo {
@@ skipping 60 matching lines @@
   if (description) {
     LOG(ERROR) << "Invalid message: " << ValidationErrorToString(error) << " ("
                << description << ")";
     if (context->message()) {
       context->message()->NotifyBadMessage(
           base::StringPrintf("Validation failed for %s [%s (%s)]",
                              context->description().data(),
                              ValidationErrorToString(error), description));
     }
   } else {
-    LOG(ERROR) << "Invalid message: " << ValidationErrorToString(error);
+    NOTREACHED() << "Invalid message: " << ValidationErrorToString(error);
     if (context->message()) {
       context->message()->NotifyBadMessage(
           base::StringPrintf("Validation failed for %s [%s]",
                              context->description().data(),
                              ValidationErrorToString(error)));
     }
   }
 }
 
 ValidationErrorObserverForTesting::ValidationErrorObserverForTesting(
@@ skipping 24 matching lines @@
 }
 
 SerializationWarningObserverForTesting::
     ~SerializationWarningObserverForTesting() {
   DCHECK(g_serialization_warning_observer == this);
   g_serialization_warning_observer = nullptr;
 }
 
 }  // namespace internal
 }  // namespace mojo