Implement BrowserPluginGuestDelegate::CreateNewGuestWindow for nativeWindowOpen

atom/browser/web_view_guest_delegate.cc

@@ -6,6 +6,7 @@
 
 #include "atom/browser/api/atom_api_web_contents.h"
 #include "atom/common/native_mate_converters/gurl_converter.h"
+#include "content/browser/web_contents/web_contents_impl.h"
 #include "content/public/browser/guest_host.h"
 #include "content/public/browser/navigation_handle.h"
 #include "content/public/browser/render_frame_host.h"
@@ -188,4 +189,19 @@ content::SiteInstance* WebViewGuestDelegate::GetOwnerSiteInstance() {
   return embedder_web_contents_->GetSiteInstance();
 }
 
+content::WebContents* WebViewGuestDelegate::CreateNewGuestWindow(
+    const content::WebContents::CreateParams& create_params) {
+  content::WebContents::CreateParams guest_params(create_params);
+  guest_params.initial_size =
+      embedder_web_contents_->GetContainerBounds().size();
+  guest_params.context = embedder_web_contents_->GetNativeView();
+  auto guest_contents = content::WebContents::Create(guest_params);
+  auto guest_contents_impl =
+      static_cast<content::WebContentsImpl*>(guest_contents);
+  guest_contents_impl->GetView()->CreateViewForWidget(
+      guest_contents->GetRenderViewHost()->GetWidget(), false);
+
+  return guest_contents;
+}
+
 }  // namespace atom

atom/browser/web_view_guest_delegate.h

@@ -64,6 +64,8 @@ class WebViewGuestDelegate : public content::BrowserPluginGuestDelegate,
   bool CanBeEmbeddedInsideCrossProcessFrames() override;
   content::RenderWidgetHost* GetOwnerRenderWidgetHost() override;
   content::SiteInstance* GetOwnerSiteInstance() override;
+  content::WebContents* CreateNewGuestWindow(
+     const content::WebContents::CreateParams& create_params) override;
 
   // WebContentsZoomController::Observer:
   void OnZoomLevelChanged(content::WebContents* web_contents,