Extensions: Prepare switch to new permission message system

extensions/common/permissions/permission_message_provider.cc

 // Copyright 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 "extensions/common/permissions/permission_message_provider.h"
 
+#include "base/strings/string_split.h"
 #include "extensions/common/extensions_client.h"
 
 namespace extensions {
 
+PermissionMessageString::PermissionMessageString(
+    const CoalescedPermissionMessage& message)
+    : message(message.message()), submessages(message.submessages()) {
+}
+
+PermissionMessageString::PermissionMessageString(const base::string16& message,
+                                                 const base::string16& details)
+    : message(message) {
+  base::SplitString(details, base::char16('\n'), &submessages);
+}
+
+PermissionMessageString::~PermissionMessageString() {
+}
+
 // static
 const PermissionMessageProvider* PermissionMessageProvider::Get() {
   return &(ExtensionsClient::Get()->GetPermissionMessageProvider());
 }
 
 }  // namespace extensions