namespace webview {
+// Attributes.
+extern const char kAttributeAutoSize[];
+extern const char kAttributeMaxHeight[];
+extern const char kAttributeMaxWidth[];
+extern const char kAttributeMinHeight[];
+extern const char kAttributeMinWidth[];
+
+// API namespace.
+// TODO(kalman): Consolidate this with the other API constants.
+extern const char kAPINamespace[];
+
// Events.
extern const char kEventClose[];
extern const char kEventConsoleMessage[];
extern const char kEventUnresponsive[];
extern const char kEventZoomChange[];
+// Event related constants.
+extern const char kWebViewEventPrefix[];
+
// Parameters/properties on events.
extern const char kContextMenuItems[];
extern const char kDefaultPromptText[];