DevTools: request app banner from DevTools without #enable-add-to-shelf flag while emulating.

chrome/browser/ui/browser.cc

Index: chrome/browser/ui/browser.cc
diff --git a/chrome/browser/ui/browser.cc b/chrome/browser/ui/browser.cc
index e62dd4758d36f6626ed8a874dc1ce8b91af95242..1d4d32f577513c5db4d9da698e35bb6430b45f79 100644
--- a/chrome/browser/ui/browser.cc
+++ b/chrome/browser/ui/browser.cc
@@ -1445,6 +1445,11 @@ scoped_ptr<content::BluetoothChooser> Browser::RunBluetoothChooser(
   return std::move(bluetooth_chooser_desktop);
 }
 
+void Browser::RequestAppBannerFromDevTools(content::WebContents* web_contents) {
+  banners::AppBannerManagerDesktop::CreateForWebContents(web_contents);
+  RequestAppBanner(web_contents);
+}
+
 bool Browser::RequestAppBanner(content::WebContents* web_contents) {
   banners::AppBannerManagerDesktop* manager =
       banners::AppBannerManagerDesktop::FromWebContents(web_contents);