Fall back to shortcut A2HS when Phonesky is out of date or unavailable.

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"
+#include "chrome/browser/android/webapk/chrome_webapk_host.h"
 #include "chrome/browser/android/webapps/add_to_homescreen_data_fetcher.h"
 
 namespace content {
 class WebContents;
 }
 
 class GURL;
 class SkBitmap;
 struct ShortcutInfo;
 
@@ skipping 15 matching lines @@
   void AddShortcut(JNIEnv* env,
                    const base::android::JavaParamRef<jobject>& obj,
                    const base::android::JavaParamRef<jstring>& title);
 
   // Starts the add-to-homescreen process.
   void Start(content::WebContents* web_contents);
 
  private:
   ~AddToHomescreenManager() override;
 
+  // Called by |Start()| which may check whether the WebAPK Install API is
+  // availabel asynchrously.
+  void StartImpl(content::WebContents* web_contents,
+                 bool check_webapk_compatible,
+                 bool can_use_webapk_install_flow);
+
+  // Checks whether the Google Play Install API is available when the Google
+  // Play install is allowed.
+  void CanUseGooglePlayInstallApi(
+      const ChromeWebApkHost::CanUseGooglePlayInstallApiCallback& callback);
+
+  // Called when the check of whether the Google Play Install API is available
+  // is done.
+  void OnCanUseGooglePlayInstallApi(content::WebContents* web_contents,
+                                    bool check_webapk_compatible,
+                                    bool isAvailable);
+
   // 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);
@@ skipping 20 matching lines @@
   // Whether the site is WebAPK-compatible.
   bool is_webapk_compatible_;
 
   // Fetches data required to add a shortcut.
   scoped_refptr<AddToHomescreenDataFetcher> data_fetcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AddToHomescreenManager);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPPS_ADD_TO_HOMESCREEN_MANAGER_H_