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..eee968a34fbd72358a2f77335621fd126e4b8fbd 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()));

[Peter Kasting, 2016/09/06 19:31:23]

Don't use EmptyGURL() just because you want to pass an empty GURL.  Use GURL()
for that.  EmptyGURL() is for functions that need to return a const ref to an
empty GURL.

Nit: Prefer a name like "shortcut_info" to a less-descriptive, code-redundant
name like "info_ptr" (we already know it's some kind of pointer from the use of
the -> operator).

[Xi Han, 2016/09/07 15:53:17]

Done.

+  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 {
@@ -190,7 +204,8 @@ void AppBannerManagerAndroid::ShowBanner() {
     bool is_webapk = ChromeWebApkHost::AreWebApkEnabled();
     std::unique_ptr<AppBannerInfoBarDelegateAndroid> delegate(
         new AppBannerInfoBarDelegateAndroid(
-            GetWeakPtr(), app_title_, manifest_url_, manifest_, icon_url_,
+            GetWeakPtr(), app_title_,
+            CreateShortcutInfo(manifest_url_, manifest_, icon_url_),
             std::move(icon_), event_request_id(), is_webapk));
 
     infobar = new AppBannerInfoBarAndroid(