Disable top-document-isolation if the parent SiteInstance is a hosted app.

chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc

Index: chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
diff --git a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
index 5ade75a38f920848d783a8d27b94d7bbec945838..e66776da517c792d1e707219f12d842e547635ae 100644
--- a/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
+++ b/chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc
@@ -685,6 +685,19 @@ ChromeContentBrowserClientExtensionsPart::GetVpnServiceProxy(
 }
 
 // static
+bool ChromeContentBrowserClientExtensionsPart::
+    ShouldFrameShareParentSiteInstanceDespiteTopDocumentIsolation(
+        const GURL& subframe_url,
+        content::SiteInstance* parent_site_instance) {
+  const Extension* extension =
+      ExtensionRegistry::Get(parent_site_instance->GetBrowserContext())
+          ->enabled_extensions()
+          .GetExtensionOrAppByURL(parent_site_instance->GetSiteURL());
+
+  return extension && extension->is_hosted_app();
+}
+
+// static
 void ChromeContentBrowserClientExtensionsPart::RecordShouldAllowOpenURLFailure(
     ShouldAllowOpenURLFailureReason reason,
     const GURL& site_url) {