Use FrameIsAd to decide whether to isolate a frame in TopDocumentIsolation mode.

content/shell/browser/shell_content_browser_client.h

Index: content/shell/browser/shell_content_browser_client.h
diff --git a/content/shell/browser/shell_content_browser_client.h b/content/shell/browser/shell_content_browser_client.h
index effcaffe3aa9b4164fa0f67ac1e040e9d2551a6a..37b1f4c1b13ecd92d78a4e132eea3187f6b66641 100644
--- a/content/shell/browser/shell_content_browser_client.h
+++ b/content/shell/browser/shell_content_browser_client.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 #include <string>
+#include <utility>
 
 #include "base/compiler_specific.h"
 #include "base/files/file_path.h"
@@ -65,6 +66,10 @@ class ShellContentBrowserClient : public ContentBrowserClient {
   SpeechRecognitionManagerDelegate* CreateSpeechRecognitionManagerDelegate()
       override;
   net::NetLog* GetNetLog() override;
+  bool ShouldIsolateFrameFromMainContent(
+      content::RenderFrameHost* frame,
+      const GURL& dest_url,
+      content::SiteInstance* main_frame_site_instance) override;
   bool ShouldSwapProcessesForRedirect(BrowserContext* browser_context,
                                       const GURL& current_url,
                                       const GURL& new_url) override;