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

chrome/browser/android/banners/app_banner_manager_android.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_MANAGER_ANDROID_H_
 #define CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_MANAGER_ANDROID_H_
 
 #include "base/android/scoped_java_ref.h"
 #include "base/callback_forward.h"
 #include "base/macros.h"
 #include "chrome/browser/banners/app_banner_manager.h"
 #include "content/public/browser/web_contents_user_data.h"
 
+struct ShortcutInfo;
+
 namespace banners {
 
 // Extends the AppBannerManager to support native Android apps.
 // This class owns a Java-side AppBannerManager which is used to interface with
 // the Java runtime for fetching native app data and installing them when
 // requested.
 // A site requests a native app banner by setting "prefer_related_applications"
 // to true in its manifest, and providing at least one related application for
 // the "play" platform with a Play Store ID.
 // This class uses that information to request the app's metadata, including an
@@ skipping 66 matching lines @@
 
   // Returns true if |platform|, |url|, and |id| are consistent and can be used
   // to query the Play Store for a native app. The query may not necessarily
   // succeed (e.g. |id| doesn't map to anything), but if this method returns
   // true, only a native app banner may be shown, and the web app banner flow
   // will not be run.
   bool CanHandleNonWebApp(const std::string& platform,
                           const GURL& url,
                           const std::string& id);
 
+  // Create shortcut info from the Web Manifest for a web app.
+  std::unique_ptr<ShortcutInfo> CreateShortcutInfo();
+
   // The Java-side AppBannerManager.
   base::android::ScopedJavaGlobalRef<jobject> java_banner_manager_;
 
   // Java-side object containing data about a native app.
   base::android::ScopedJavaGlobalRef<jobject> native_app_data_;
 
   // App package name for a native app banner.
   std::string native_app_package_;
 
   DISALLOW_COPY_AND_ASSIGN(AppBannerManagerAndroid);
 };
 
 }  // namespace banners
 
 #endif  // CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_MANAGER_ANDROID_H_