Expose window.internals when enabled by flag (#4840)

b/393406740

cobalt/renderer/BUILD.gn

@@ -16,6 +16,8 @@ source_set("renderer") {
   sources = [
     "cobalt_content_renderer_client.cc",
     "cobalt_content_renderer_client.h",
+    "cobalt_render_frame_observer.cc",
+    "cobalt_render_frame_observer.h",
   ]
 
   deps = [

cobalt/renderer/cobalt_content_renderer_client.cc

@@ -6,6 +6,7 @@
 
 #include <string>
 
+#include "cobalt/renderer/cobalt_render_frame_observer.h"
 #include "components/cdm/renderer/widevine_key_system_info.h"
 #include "starboard/media.h"
 
@@ -72,6 +73,7 @@ CobaltContentRendererClient::~CobaltContentRendererClient() {}
 void CobaltContentRendererClient::RenderFrameCreated(
     content::RenderFrame* render_frame) {
   new js_injection::JsCommunication(render_frame);
+  new CobaltRenderFrameObserver(render_frame);
 }
 
 #if BUILDFLAG(IS_ANDROID)

cobalt/renderer/cobalt_render_frame_observer.cc

@@ -0,0 +1,42 @@
+// Copyright 2025 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "cobalt/renderer/cobalt_render_frame_observer.h"
+
+#include "base/command_line.h"
+#include "cobalt/common/shell_switches.h"
+#include "content/public/renderer/render_frame.h"
+#include "third_party/blink/public/web/web_testing_support.h"
+
+namespace cobalt {
+
+CobaltRenderFrameObserver::CobaltRenderFrameObserver(
+    content::RenderFrame* render_frame)
+    : content::RenderFrameObserver(render_frame) {}
+
+CobaltRenderFrameObserver::~CobaltRenderFrameObserver() = default;
+
+void CobaltRenderFrameObserver::OnDestruct() {
+  delete this;
+}
+
+void CobaltRenderFrameObserver::DidClearWindowObject() {
+  auto& cmd = *base::CommandLine::ForCurrentProcess();
+  if (cmd.HasSwitch(switches::kExposeInternalsForTesting)) {
+    blink::WebTestingSupport::InjectInternalsObject(
+        render_frame()->GetWebFrame());
+  }
+}
+
+}  // namespace cobalt

cobalt/renderer/cobalt_render_frame_observer.h

@@ -0,0 +1,39 @@
+// Copyright 2025 The Cobalt Authors. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef COBALT_RENDERER_COBALT_RENDERER_FRAME_OBSERVER_H_
+#define COBALT_RENDERER_COBALT_RENDERER_FRAME_OBSERVER_H_
+
+#include "content/public/renderer/render_frame.h"
+#include "content/public/renderer/render_frame_observer.h"
+
+namespace cobalt {
+
+class CobaltRenderFrameObserver : public content::RenderFrameObserver {
+ public:
+  explicit CobaltRenderFrameObserver(content::RenderFrame* render_frame);
+  ~CobaltRenderFrameObserver() override;
+
+  CobaltRenderFrameObserver(const CobaltRenderFrameObserver&) = delete;
+  CobaltRenderFrameObserver& operator=(const CobaltRenderFrameObserver&) =
+      delete;
+
+ private:
+  void OnDestruct() override;
+  void DidClearWindowObject() override;
+};
+
+}  // namespace cobalt
+
+#endif  // COBALT_RENDERER_COBALT_RENDERER_FRAME_OBSERVER_H_