Add constant values for the webNavigation API....

chrome/browser/extensions/extension_web_navigation_api_constants.cc

+// Copyright (c) 2010 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 "chrome/browser/extensions/extension_web_navigation_api_constants.h"
+
+namespace extension_web_navigation_api_constants {
+
+const wchar_t kErrorKey[] = L"error";
+const wchar_t kFrameIdKey[] = L"frameId";
+const wchar_t kRequestIdKey[] = L"requestId";
+const wchar_t kSourceTabIdKey[] = L"sourceTabId";
+const wchar_t kSourceUrlKey[] = L"sourceUrl";
+const wchar_t kTabIdKey[] = L"tabId";
+const wchar_t kTargetUrlKey[] = L"targetUrl";
+const wchar_t kTimeStampKey[] = L"timeStamp";
+const wchar_t kTransitionTypeKey[] = L"transitionType";
+const wchar_t kUrlKey[] = L"url";
+
+const char kOnBeforeNavigate[] = "experimental.webNavigation.onBeforeNavigate";
+const char kOnBeforeRetarget[] = "experimental.webNavigation.onBeforeRetarget";
+const char kOnCommitted[] = "experimental.webNavigation.onCommitted";
+const char kOnCompleted[] = "experimental.webNavigation.onCompleted";
+const char kOnDOMContentLoaded[] =
+    "experimental.webNavigation.onDOMContentLoaded";
+const char kOnErrorOccurred[] = "experimental.webNavigation.onErrorOccurred";
+
+}  // namespace extension_web_navigation_api_constants