Reland: Refactor code that defers extension background page loading

extensions/browser/extensions_browser_client.h

 // Copyright 2013 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 EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 #define EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 23 matching lines @@
 
 class ApiActivityMonitor;
 class AppSorting;
 class ComponentExtensionResourceManager;
 class Extension;
 class ExtensionHostDelegate;
 class ExtensionPrefsObserver;
 class ExtensionSystem;
 class ExtensionSystemProvider;
 class InfoMap;
+class ProcessManagerDelegate;
 class RuntimeAPIDelegate;
 
 // Interface to allow the extensions module to make browser-process-specific
 // queries of the embedder. Should be Set() once in the browser process.
 //
 // NOTE: Methods that do not require knowledge of browser concepts should be
 // added in ExtensionsClient (extensions/common/extensions_client.h) even if
 // they are only used in the browser process.
 class ExtensionsBrowserClient {
  public:
@@ skipping 72 matching lines @@
   virtual PrefService* GetPrefServiceForContext(
       content::BrowserContext* context) = 0;
 
   // Populates a list of ExtensionPrefs observers to be attached to each
   // BrowserContext's ExtensionPrefs upon construction. These observers
   // are not owned by ExtensionPrefs.
   virtual void GetEarlyExtensionPrefsObservers(
       content::BrowserContext* context,
       std::vector<ExtensionPrefsObserver*>* observers) const = 0;
 
-  // Returns true if loading background pages should be deferred.
-  virtual bool DeferLoadingBackgroundHosts(
-      content::BrowserContext* context) const = 0;
-
-  virtual bool IsBackgroundPageAllowed(
-      content::BrowserContext* context) const = 0;
+  // Returns the ProcessManagerDelegate shared across all BrowserContexts. May
+  // return NULL in tests or for simple embedders.
+  virtual ProcessManagerDelegate* GetProcessManagerDelegate() const = 0;
 
   // Creates a new ExtensionHostDelegate instance.
   virtual scoped_ptr<ExtensionHostDelegate> CreateExtensionHostDelegate() = 0;
 
   // Returns true if the client version has updated since the last run. Called
   // once each time the extensions system is loaded per browser_context. The
   // implementation may wish to use the BrowserContext to record the current
   // version for later comparison.
   virtual bool DidVersionUpdate(content::BrowserContext* context) = 0;
 
@@ skipping 30 matching lines @@
   // Returns the single instance of |this|.
   static ExtensionsBrowserClient* Get();
 
   // Initialize the single instance.
   static void Set(ExtensionsBrowserClient* client);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSIONS_BROWSER_CLIENT_H_