mac: Fix compile error.

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@1170 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

tests/cefclient/process_helper_mac.cpp

@@ -17,6 +17,9 @@ CefWindowHandle AppGetMainHwnd() {
 }
 void AppQuitMessageLoop() {
 }
+bool AppIsOffScreenRenderingEnabled() {
+  return false;
+}
 
 // Process entry point.
 int main(int argc, char* argv[]) {