Mojo: Report bindings validation errors via MojoNotifyBadMessage

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

Index: mojo/public/cpp/bindings/lib/validation_errors.cc
diff --git a/mojo/public/cpp/bindings/lib/validation_errors.cc b/mojo/public/cpp/bindings/lib/validation_errors.cc
index e5743eb8a16c8618a854e2260642ed1a8aa392a5..ea6aff8f151ca70867bf3e9e37f0ee684450ba16 100644
--- a/mojo/public/cpp/bindings/lib/validation_errors.cc
+++ b/mojo/public/cpp/bindings/lib/validation_errors.cc
@@ -4,6 +4,9 @@
 
 #include "mojo/public/cpp/bindings/lib/validation_errors.h"
 
+#include "base/strings/stringprintf.h"
+#include "mojo/public/cpp/bindings/message.h"
+
 namespace mojo {
 namespace internal {
 namespace {
@@ -50,19 +53,38 @@ const char* ValidationErrorToString(ValidationError error) {
       return "VALIDATION_ERROR_UNKNOWN_UNION_TAG";
     case VALIDATION_ERROR_UNKNOWN_ENUM_VALUE:
       return "VALIDATION_ERROR_UNKNOWN_ENUM_VALUE";
+    case VALIDATION_ERROR_DESERIALIZATION_FAILED:
+      return "VALIDATION_ERROR_DESERIALIZATION_FAILED";
   }
 
   return "Unknown error";
 }
 
-void ReportValidationError(ValidationError error, const char* description) {
+void ReportValidationError(ValidationContext* context,
+                           ValidationError error,
+                           const char* description) {
   if (g_validation_error_observer) {
     g_validation_error_observer->set_last_error(error);
-  } else if (description) {
+    return;
+  }
+
+  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);
+    if (context->message()) {
+      context->message()->NotifyBadMessage(
+          base::StringPrintf("Validation failed for %s [%s]",
+                             context->description().data(),
+                             ValidationErrorToString(error)));
+    }
   }
 }