chrome: cefclient: Add default handler for request tests (see issue #3444)

Support loading of request tests (e.g. http://tests/other_tests) inside default
browsers created via "New window" and "New incognito window" commands.

tests/cefclient/browser/default_client_handler.cc

@@ -0,0 +1,60 @@
+// Copyright (c) 2023 The Chromium Embedded Framework Authors. All rights
+// reserved. Use of this source code is governed by a BSD-style license that
+// can be found in the LICENSE file.
+
+#include "tests/cefclient/browser/default_client_handler.h"
+
+#include "tests/cefclient/browser/test_runner.h"
+
+namespace client {
+
+DefaultClientHandler::DefaultClientHandler() {
+  resource_manager_ = new CefResourceManager();
+  test_runner::SetupResourceManager(resource_manager_, nullptr);
+}
+
+CefRefPtr<CefResourceRequestHandler>
+DefaultClientHandler::GetResourceRequestHandler(
+    CefRefPtr<CefBrowser> browser,
+    CefRefPtr<CefFrame> frame,
+    CefRefPtr<CefRequest> request,
+    bool is_navigation,
+    bool is_download,
+    const CefString& request_initiator,
+    bool& disable_default_handling) {
+  CEF_REQUIRE_IO_THREAD();
+  return this;
+}
+
+cef_return_value_t DefaultClientHandler::OnBeforeResourceLoad(
+    CefRefPtr<CefBrowser> browser,
+    CefRefPtr<CefFrame> frame,
+    CefRefPtr<CefRequest> request,
+    CefRefPtr<CefCallback> callback) {
+  CEF_REQUIRE_IO_THREAD();
+
+  return resource_manager_->OnBeforeResourceLoad(browser, frame, request,
+                                                 callback);
+}
+
+CefRefPtr<CefResourceHandler> DefaultClientHandler::GetResourceHandler(
+    CefRefPtr<CefBrowser> browser,
+    CefRefPtr<CefFrame> frame,
+    CefRefPtr<CefRequest> request) {
+  CEF_REQUIRE_IO_THREAD();
+
+  return resource_manager_->GetResourceHandler(browser, frame, request);
+}
+
+CefRefPtr<CefResponseFilter> DefaultClientHandler::GetResourceResponseFilter(
+    CefRefPtr<CefBrowser> browser,
+    CefRefPtr<CefFrame> frame,
+    CefRefPtr<CefRequest> request,
+    CefRefPtr<CefResponse> response) {
+  CEF_REQUIRE_IO_THREAD();
+
+  return test_runner::GetResourceResponseFilter(browser, frame, request,
+                                                response);
+}
+
+}  // namespace client