Trigger app banner when add to homescreen is pressed and WebAPKs are enabled.

chrome/browser/android/banners/app_banner_manager_android.cc

Index: chrome/browser/android/banners/app_banner_manager_android.cc
diff --git a/chrome/browser/android/banners/app_banner_manager_android.cc b/chrome/browser/android/banners/app_banner_manager_android.cc
index d7ba9c2dc61d2f8311e06b84d11a1c68bc62bbea..64bfec99ad5f231d1084d82b63e963cfc3d2229a 100644
--- a/chrome/browser/android/banners/app_banner_manager_android.cc
+++ b/chrome/browser/android/banners/app_banner_manager_android.cc
@@ -40,6 +40,20 @@ const char kReferrerName[] = "referrer";
 const char kIdName[] = "id";
 const char kPlayInlineReferrer[] = "playinline=chrome_inline";
 
+std::unique_ptr<ShortcutInfo> CreateShortcutInfo(
+    const GURL& manifest_url,
+    const content::Manifest& manifest,
+    const GURL& icon_url) {
+  std::unique_ptr<ShortcutInfo> info_ptr(new ShortcutInfo(GURL::EmptyGURL()));
+  if (!manifest.IsEmpty()) {
+    info_ptr->UpdateFromManifest(manifest);
+    info_ptr->manifest_url = manifest_url;
+    info_ptr->icon_url = icon_url;
+    info_ptr->UpdateSource(ShortcutInfo::SOURCE_APP_BANNER);
+  }
+  return info_ptr;
+}
+
 }  // anonymous namespace
 
 namespace banners {
@@ -190,8 +204,9 @@ void AppBannerManagerAndroid::ShowBanner() {
     bool is_webapk = ChromeWebApkHost::AreWebApkEnabled();
     std::unique_ptr<AppBannerInfoBarDelegateAndroid> delegate(
         new AppBannerInfoBarDelegateAndroid(
-            GetWeakPtr(), app_title_, manifest_url_, manifest_, icon_url_,
-            std::move(icon_), event_request_id(), is_webapk));
+            GetWeakPtr(), app_title_, manifest_url_,
+            CreateShortcutInfo(manifest_url_, manifest_, icon_url_),
+            icon_url_, std::move(icon_), event_request_id(), is_webapk));
 
     infobar = new AppBannerInfoBarAndroid(
         std::move(delegate), manifest_.start_url, is_webapk);