1 files changed, 29 insertions, 0 deletions
diff --git a/ipc/chromium/src/mojo/core/ports/message_filter.h b/ipc/chromium/src/mojo/core/ports/message_filter.h
new file mode 100644
index 0000000000..21f8c1c869
--- /dev/null
+++ b/ipc/chromium/src/mojo/core/ports/message_filter.h
@@ -0,0 +1,29 @@
+// Copyright 2016 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.
+
+#ifndef MOJO_CORE_PORTS_MESSAGE_FILTER_H_
+#define MOJO_CORE_PORTS_MESSAGE_FILTER_H_
+
+namespace mojo {
+namespace core {
+namespace ports {
+
+class UserMessageEvent;
+
+// An interface which can be implemented to user message events according to
+// arbitrary policy.
+class MessageFilter {
+ public:
+  virtual ~MessageFilter() = default;
+
+  // Returns true if |message| should be accepted by whomever is applying this
+  // filter. See MessageQueue::GetNextMessage(), for example.
+  virtual bool Match(const UserMessageEvent& message) = 0;
+};
+
+}  // namespace ports
+}  // namespace core
+}  // namespace mojo
+
+#endif  // MOJO_CORE_PORTS_MESSAGE_FILTER_H_