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

libcef/browser/browser_host_impl.h

@@ -16,6 +16,7 @@
 #include "include/cef_client.h"
 #include "include/cef_frame.h"
 #include "libcef/browser/frame_host_impl.h"
+#include "libcef/browser/javascript_dialog_creator.h"
 #include "libcef/browser/url_request_context_getter_proxy.h"
 #include "libcef/common/response_manager.h"
 
@@ -353,6 +354,9 @@ class CefBrowserHostImpl : public CefBrowserHost,
   // Used for proxying cookie requests.
   scoped_refptr<CefURLRequestContextGetterProxy> request_context_proxy_;
 
+  // Used for creating and managing JavaScript dialogs.
+  scoped_ptr<CefJavaScriptDialogCreator> dialog_creator_;
+
   IMPLEMENT_REFCOUNTING(CefBrowserHostImpl);
   DISALLOW_EVIL_CONSTRUCTORS(CefBrowserHostImpl);
 };