Add "Request app banner" context menu in DevTools

content/browser/devtools/protocol/page_handler.cc

Index: content/browser/devtools/protocol/page_handler.cc
diff --git a/content/browser/devtools/protocol/page_handler.cc b/content/browser/devtools/protocol/page_handler.cc
index 7e79a7200cf851c936c9d6f9b077337cb5b6faf3..075059e4c1d5740d1b08c6e44ec12f724ca498e7 100644
--- a/content/browser/devtools/protocol/page_handler.cc
+++ b/content/browser/devtools/protocol/page_handler.cc
@@ -357,6 +357,15 @@ Response PageHandler::SetColorPickerEnabled(bool enabled) {
   return Response::OK();
 }
 
+Response PageHandler::CanOpenAppBanner(bool* result) {
+  *result = false;
+  return Response::OK();
+}
+
+Response PageHandler::OpenAppBanner(bool* result) {
+  return Response::InternalError("OpenAppBanner is not supported");
+}
+
 WebContentsImpl* PageHandler::GetWebContents() {
   return host_ ?
       static_cast<WebContentsImpl*>(WebContents::FromRenderFrameHost(host_)) :