Add InputEvent and EventPacket types for batched input delivery

content/common/input/ipc_input_event_payload.cc

+// Copyright (c) 2013 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 "content/common/input/ipc_input_event_payload.h"
+
+namespace content {
+
+scoped_ptr<IPCInputEventPayload> IPCInputEventPayload::Create() {
+  return make_scoped_ptr(new IPCInputEventPayload());
+}
+
+scoped_ptr<IPCInputEventPayload> IPCInputEventPayload::Create(
+    scoped_ptr<IPC::Message> message) {
+  DCHECK(message);
+  scoped_ptr<IPCInputEventPayload> payload = Create();
+  payload->message = message.Pass();
+  return payload.Pass();
+}
+
+const IPCInputEventPayload* IPCInputEventPayload::Cast(const Payload* payload) {
+  DCHECK(payload);
+  DCHECK_EQ(IPC_MESSAGE, payload->GetType());
+  return static_cast<const IPCInputEventPayload*>(payload);
+}
+
+IPCInputEventPayload::IPCInputEventPayload() {}
+
+IPCInputEventPayload::~IPCInputEventPayload() {}
+
+InputEvent::Payload::Type IPCInputEventPayload::GetType() const {
+  return IPC_MESSAGE;
+}
+
+}  // namespace content