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

chrome/browser/android/webapps/add_to_homescreen_manager.h

 // Copyright 2016 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_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_
 
 #include "base/android/jni_android.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/macros.h"
@@ skipping 50 matching lines @@
   void StartFetching(content::WebContents* web_contents,
                      bool check_installable);
 
   // Shows alert to prompt user for name of home screen shortcut.
   void ShowDialog();
 
   // Called only when the AddToHomescreenDataFetcher has retrieved all of the
   // data needed to add the shortcut.
   void AddShortcut(const ShortcutInfo& info, const SkBitmap& icon);
 
+  // Called only when the AddToHomescreenDataFetcher has retrieved all of the
+  // data needed to install a WebAPK.
+  void CreateInfoBarForWebAPK(const ShortcutInfo& info, const SkBitmap& icon);
+
   void RecordAddToHomescreen();
 
   // AddToHomescreenDataFetcher::Observer:
   void OnDidDetermineWebApkCompatibility(bool is_webapk_compatible) override;
   void OnUserTitleAvailable(const base::string16& user_title) override;
   void OnDataAvailable(const ShortcutInfo& info, const SkBitmap& icon) override;
   SkBitmap FinalizeLauncherIconInBackground(const SkBitmap& icon,
                                             const GURL& url,
                                             bool* is_generated) override;
 
   // Points to the Java object.
   base::android::ScopedJavaGlobalRef<jobject> java_ref_;
 
   // Whether the user has requested that a shortcut be added while a fetch was
   // in progress.
   bool add_shortcut_pending_;
 
+  // Whether the site is WebAPK-compatible.
+  bool is_webapk_compatible_;
+
   // Fetches data required to add a shortcut.
   scoped_refptr<AddToHomescreenDataFetcher> data_fetcher_;
 
   base::WeakPtrFactory<AddToHomescreenManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenManager);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_