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.cc

@@ -852,10 +852,10 @@ void CefBrowserHostImpl::DidNavigateMainFramePostCommit(
 }
 
 content::JavaScriptDialogCreator*
-CefBrowserHostImpl::GetJavaScriptDialogCreator() {
-  // TODO(cef): Provide a custom JavaScriptDialogCreator implementation to
-  // support JavaScript alerts, prompts, etc.
-  return content::WebContentsDelegate::GetJavaScriptDialogCreator();
+    CefBrowserHostImpl::GetJavaScriptDialogCreator() {
+  if (!dialog_creator_.get())
+    dialog_creator_.reset(new CefJavaScriptDialogCreator(this));
+  return dialog_creator_.get();
 }
 
 void CefBrowserHostImpl::RunFileChooser(