Run ShortcutHelper::AddToLauncherInBackgroundWithSkBitmap() on Worker thread instead of IO thread

chrome/browser/android/webapk/webapk_installer.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_WEBAPK_WEBAPK_INSTALLER_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALLER_H_
 
 #include <jni.h>
 #include <memory>
 
@@ skipping 61 matching lines @@
  private:
   // net::URLFetcherDelegate:
   void OnURLFetchComplete(const net::URLFetcher* source) override;
 
   // Initializes |request_context_getter_| on UI thread.
   void InitializeRequestContextGetterOnUIThread(
       content::BrowserContext* browser_context);
 
   // Sends request to WebAPK server to create WebAPK. During a successful
   // request the WebAPK server responds with the URL of the generated WebAPK.
-  void SendCreateWebApkRequest();
+  // |webapk| is the proto to send to the WebAPK server.
+  void SendCreateWebApkRequest(std::unique_ptr<webapk::WebApk> webapk_proto);
 
   // Called with the URL of generated WebAPK and the package name that the
   // WebAPK should be installed at.
   void OnGotWebApkDownloadUrl(const GURL& download_url,
                               const std::string& package_name);
 
   // Called once the WebAPK has been downloaded. Installs the WebAPK if the
   // download was successful.
   // |file_path| is the file path that the WebAPK was downloaded to.
   // |package_name| is the package name that the WebAPK should be installed at.
   void OnWebApkDownloaded(const base::FilePath& file_path,
                           const std::string& package_name,
                           FileDownloader::Result result);
 
   // Populates webapk::WebApk and returns it.
-  std::unique_ptr<webapk::WebApk> BuildWebApkProto();
+  // Must be called on a worker thread.
+  std::unique_ptr<webapk::WebApk> BuildWebApkProtoInBackground();
 
   // Called when the request to the WebAPK server times out or when the WebAPK
   // download times out.
   void OnTimeout();
 
   // Called when the request to install the WebAPK is sent to Google Play.
   void OnSuccess();
 
   // Called if a WebAPK could not be created. WebApkInstaller only tracks the
   // WebAPK creation and the WebAPK download. It does not track the
@@ skipping 25 matching lines @@
   // WebAPK server URL.
   GURL server_url_;
 
   // The number of milliseconds to wait for the WebAPK download URL from the
   // WebAPK server.
   int webapk_download_url_timeout_ms_;
 
   // The number of milliseconds to wait for the WebAPK download to complete.
   int download_timeout_ms_;
 
-  // Used to get |weak_ptr_| on the IO thread.
-  base::WeakPtrFactory<WebApkInstaller> io_weak_ptr_factory_;
+  // Used to get |weak_ptr_|.
+  base::WeakPtrFactory<WebApkInstaller> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebApkInstaller);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALLER_H_