Add support for response filtering (issue #515).

- Add a new CefRequestHandler::GetResourceResponseFilter method and
  CefResponseFilter class.

tests/cefclient/browser/test_runner.cc

@@ -19,6 +19,7 @@
 #include "cefclient/browser/preferences_test.h"
 #include "cefclient/browser/resource.h"
 #include "cefclient/browser/resource_util.h"
+#include "cefclient/browser/response_filter_test.h"
 #include "cefclient/browser/root_window_manager.h"
 #include "cefclient/browser/scheme_test.h"
 #include "cefclient/browser/urlrequest_test.h"
@@ -729,5 +730,15 @@ void RegisterSchemeHandlers() {
   scheme_test::RegisterSchemeHandlers();
 }
 
+CefRefPtr<CefResponseFilter> GetResourceResponseFilter(
+    CefRefPtr<CefBrowser> browser,
+    CefRefPtr<CefFrame> frame,
+    CefRefPtr<CefRequest> request,
+    CefRefPtr<CefResponse> response) {
+  // Create the response filter.
+  return response_filter_test::GetResourceResponseFilter(browser, frame,
+                                                         request, response);
+}
+
 }  // namespace test_runner
 }  // namespace client