Use exponential backoff for component extension reloads.

chrome/browser/background/background_contents_service.h

 // Copyright (c) 2012 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_BACKGROUND_BACKGROUND_CONTENTS_SERVICE_H_
 #define CHROME_BROWSER_BACKGROUND_BACKGROUND_CONTENTS_SERVICE_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/scoped_observer.h"
 #include "chrome/browser/background/background_contents.h"
 #include "components/keyed_service/core/keyed_service.h"
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/common/window_container_type.h"
 #include "extensions/browser/extension_registry_observer.h"
+#include "net/base/backoff_entry.h"
 #include "ui/base/window_open_disposition.h"
 #include "url/gurl.h"
 
 class PrefService;
 class Profile;
 
 namespace base {
 class CommandLine;
 class DictionaryValue;
 }
@@ skipping 198 matching lines @@
   };
 
   // Map associating currently loaded BackgroundContents with their parent
   // applications.
   // Key: application id
   // Value: BackgroundContentsInfo for the BC associated with that application
   typedef std::map<base::string16, BackgroundContentsInfo>
       BackgroundContentsMap;
   BackgroundContentsMap contents_map_;
 
+  // Map associating component extensions that have attempted to reload with a
+  // BackoffEntry keeping track of retry timing.
+  typedef std::map<extensions::ExtensionId, std::unique_ptr<net::BackoffEntry>>
+      ExtensionBackoffEntryMap;
+  ExtensionBackoffEntryMap backoff_map_;
+
   ScopedObserver<extensions::ExtensionRegistry,
                  extensions::ExtensionRegistryObserver>
       extension_registry_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(BackgroundContentsService);
 };
 
 #endif  // CHROME_BROWSER_BACKGROUND_BACKGROUND_CONTENTS_SERVICE_H_