Implement ManifestManager to handle manifest in content/

content/common/manifest_manager_messages.h

+// 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.
+
+// IPC messages for the web manifest manager.
+// Multiply-included message file, hence no include guard.
+
+#include "content/common/content_export.h"
+#include "content/public/common/manifest.h"
+#include "ipc/ipc_message_macros.h"
+
+#undef IPC_MESSAGE_EXPORT
+#define IPC_MESSAGE_EXPORT CONTENT_EXPORT
+
+#define IPC_MESSAGE_START ManifestManagerMsgStart
+
+IPC_STRUCT_TRAITS_BEGIN(content::Manifest)
+  IPC_STRUCT_TRAITS_MEMBER(name)
+  IPC_STRUCT_TRAITS_MEMBER(short_name)
+IPC_STRUCT_TRAITS_END()
+
+// The browser process requests for the manifest linked with the associated
+// render frame. The renderer process will respond via a RequestManifestResponse
+// IPC message with a Manifest object attached to it and the associated
+// |request_id| that was initially given.
+IPC_MESSAGE_ROUTED1(ManifestManagerMsg_RequestManifest,
+                    int /* request_id */)
+
+// The renderer process' response to a RequestManifest. The |request_id| will
+// match the one that was initially received. The |manifest| object will be an
+// empty manifest in case of any failure.
+IPC_MESSAGE_ROUTED2(ManifestManagerHostMsg_RequestManifestResponse,
+                    int, /* request_id */
+                    content::Manifest /* manifest */)