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..57853e49d69d42ef95a4de06acd61eab9fa42ff2 100644
--- a/chrome/browser/android/banners/app_banner_manager_android.cc
+++ b/chrome/browser/android/banners/app_banner_manager_android.cc
@@ -12,6 +12,7 @@
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/android/banners/app_banner_infobar_delegate_android.h"
 #include "chrome/browser/android/shortcut_helper.h"
+#include "chrome/browser/android/shortcut_info.h"
 #include "chrome/browser/android/webapk/chrome_webapk_host.h"
 #include "chrome/browser/android/webapk/webapk_web_manifest_checker.h"
 #include "chrome/browser/banners/app_banner_metrics.h"
@@ -188,9 +189,10 @@ void AppBannerManagerAndroid::ShowBanner() {
   infobars::InfoBar* infobar = nullptr;
   if (native_app_data_.is_null()) {
     bool is_webapk = ChromeWebApkHost::AreWebApkEnabled();
+    std::unique_ptr<ShortcutInfo> info = CreateShortcutInfo();
     std::unique_ptr<AppBannerInfoBarDelegateAndroid> delegate(
         new AppBannerInfoBarDelegateAndroid(
-            GetWeakPtr(), app_title_, manifest_url_, manifest_, icon_url_,
+            GetWeakPtr(), app_title_, manifest_url_, std::move(info), icon_url_,
             std::move(icon_), event_request_id(), is_webapk));
 
     infobar = new AppBannerInfoBarAndroid(
@@ -224,6 +226,17 @@ void AppBannerManagerAndroid::ShowBanner() {
   }
 }
 
+std::unique_ptr<ShortcutInfo> AppBannerManagerAndroid::CreateShortcutInfo() {

[dominickn, 2016/09/01 05:22:00]

Put this method in the anonymous namespace in AppBannerInfoBarDelegateAndroid,
and call it in the appropriate constructor. That means this file doesn't need to
change.

[Xi Han, 2016/09/01 18:44:14]

Done.

+  std::unique_ptr<ShortcutInfo> info_ptr(new ShortcutInfo(GURL::EmptyGURL()));
+  if (manifest_.IsEmpty())
+    return info_ptr;
+  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;
+}
+
 bool AppBannerManagerAndroid::CanHandleNonWebApp(const std::string& platform,
                                                  const GURL& url,
                                                  const std::string& id) {