Implement server-suggested update check backoff

chrome/browser/android/webapk/webapk_install_service.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_INSTALL_SERVICE_H_
 #define CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALL_SERVICE_H_
 
 #include <map>
 #include <set>
 #include <string>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
+#include "chrome/browser/android/webapk/webapk_installer.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "url/gurl.h"
 
 namespace content {
 class BrowserContext;
 }
 
 struct ShortcutInfo;
 class SkBitmap;
 
 // Service which talks to Chrome WebAPK server and Google Play to generate a
 // WebAPK on the server, download it, and install it.
 class WebApkInstallService : public KeyedService {
  public:
-  // Called when the creation/updating of a WebAPK is finished or failed.
-  // Parameters:
-  // - whether the process succeeds.
-  // - the package name of the WebAPK.
-  using FinishCallback = base::Callback<void(bool, const std::string&)>;
+  using FinishCallback = WebApkInstaller::FinishCallback;
 
   static WebApkInstallService* Get(content::BrowserContext* browser_context);
 
   explicit WebApkInstallService(content::BrowserContext* browser_context);
   ~WebApkInstallService() override;
 
   // Returns whether an install for |web_manifest_url| is in progress.
   bool IsInstallInProgress(const GURL& web_manifest_url);
 
   // Talks to the Chrome WebAPK server to generate a WebAPK on the server and to
@@ skipping 13 matching lines @@
       int webapk_version,
       const std::map<std::string, std::string>& icon_url_to_murmur2_hash,
       bool is_manifest_stale,
       const FinishCallback& finish_callback);
 
  private:
   // Called once the install/update completed or failed.
   void OnFinishedInstall(const GURL& web_manifest_url,
                          const FinishCallback& finish_callback,
                          bool success,
+                         bool relax_updates,
                          const std::string& webapk_package_name);
 
   content::BrowserContext* browser_context_;
 
   // In progress installs.
   std::set<GURL> installs_;
 
   // Used to get |weak_ptr_|.
   base::WeakPtrFactory<WebApkInstallService> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(WebApkInstallService);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_WEBAPK_WEBAPK_INSTALL_SERVICE_H_