Add support for JavaScript alert, confirm, prompt and onbeforeunload dialogs (issue #507).

- Add CefJSDialogHandler and CefJSDialogCallback interfaces.
- Add default dialog implementations for Windows and Mac OS-X.
- Add "JavaScript Dialogs" example to cefclient.
- Change TestHandler::AddResource to ignore the query component when matching URLs.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@594 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/internal/cef_types.h

@@ -769,6 +769,15 @@ enum cef_value_type_t {
   VTYPE_LIST,
 };
 
+///
+// Supported JavaScript dialog types.
+///
+enum cef_jsdialog_type_t {
+  JSDIALOGTYPE_ALERT = 0,
+  JSDIALOGTYPE_CONFIRM,
+  JSDIALOGTYPE_PROMPT,
+};
+
 ///
 // Supported XML encoding types. The parser supports ASCII, ISO-8859-1, and
 // UTF16 (LE and BE) by default. All other types must be translated to UTF8