chrome: win: Fix taskbar grouping of PiP and DevTools windows (fixes #3641)

libcef/browser/chrome/browser_delegate.h

@@ -141,6 +141,10 @@ class BrowserDelegate : public content::WebContentsDelegate {
 
   // Called at the end of a fullscreen transition.
   virtual void WindowFullscreenStateChanged() {}
+
+  // Returns true if this browser has a Views-hosted opener. Only
+  // applicable for Browsers of type picture_in_picture and devtools.
+  virtual bool HasViewsHostedOpener() const { return false; }
 };
 
 }  // namespace cef

libcef/browser/chrome/chrome_browser_delegate.cc

@@ -426,6 +426,12 @@ void ChromeBrowserDelegate::WindowFullscreenStateChanged() {
 #endif
 }
 
+bool ChromeBrowserDelegate::HasViewsHostedOpener() const {
+  DCHECK(browser_->is_type_picture_in_picture() ||
+         browser_->is_type_devtools());
+  return opener_host_ && opener_host_->is_views_hosted();
+}
+
 void ChromeBrowserDelegate::WebContentsCreated(
     content::WebContents* source_contents,
     int opener_render_process_id,

libcef/browser/chrome/chrome_browser_delegate.h

@@ -81,6 +81,7 @@ class ChromeBrowserDelegate : public cef::BrowserDelegate {
   const std::optional<SkRegion> GetDraggableRegion() const override;
   void UpdateDraggableRegion(const SkRegion& region) override;
   void WindowFullscreenStateChanged() override;
+  bool HasViewsHostedOpener() const override;
 
   // WebContentsDelegate methods:
   void WebContentsCreated(content::WebContents* source_contents,