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

tests/cefclient/cefclient_win.cpp

@@ -377,6 +377,10 @@ LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam,
         if (browser.get())
           binding_test::RunTest(browser);
         return 0;
+      case ID_TESTS_DIALOGS:  // Test JavaScript dialofs
+        if (browser.get())
+          RunDialogTest(browser);
+        return 0;
       case ID_TESTS_LOCALSTORAGE:  // Test localStorage
         if (browser.get())
           RunLocalStorageTest(browser);