Add support for distilling arbitrary URLs in DOM Distiller Viewer.

components/dom_distiller/core/url_constants.h

Index: components/dom_distiller/core/url_constants.h
diff --git a/components/dom_distiller/core/url_constants.h b/components/dom_distiller/core/url_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..a724a224b794a2030ea1115b088427421ad4c49a
--- /dev/null
+++ b/components/dom_distiller/core/url_constants.h
@@ -0,0 +1,16 @@
+// 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.
+
+#ifndef COMPONENTS_DOM_DISTILLER_CORE_URL_CONSTANTS_H_
+#define COMPONENTS_DOM_DISTILLER_CORE_URL_CONSTANTS_H_
+
+namespace dom_distiller {
+
+extern const char kEntryIdKey[];
+extern const char kUrlKey[];
+extern const char kCssPath[];
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_CORE_URL_CONSTANTS_H_