Introduce runtime.onSuspendCanceled() event.

chrome/browser/extensions/extension_process_manager.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_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 18 matching lines @@
 
 namespace extensions {
 class Extension;
 }
 
 // Manages dynamic state of running Chromium extensions. There is one instance
 // of this class per Profile. OTR Profiles have a separate instance that keeps
 // track of split-mode extensions only.
 class ExtensionProcessManager : public content::NotificationObserver {
  public:
-  enum ShouldCancelSuspend {
-    CANCEL_SUSPEND,
-    DONT_CANCEL_SUSPEND
-  };
   typedef std::set<ExtensionHost*> ExtensionHostSet;
   typedef ExtensionHostSet::const_iterator const_iterator;
 
   static ExtensionProcessManager* Create(Profile* profile);
   virtual ~ExtensionProcessManager();
 
   const ExtensionHostSet& background_hosts() const {
     return background_hosts_;
   }
 
@@ skipping 57 matching lines @@
       content::RenderViewHost* render_view_host);
 
   // Returns true if the (lazy) background host for the given extension has
   // already been sent the unload event and is shutting down.
   bool IsBackgroundHostClosing(const std::string& extension_id);
 
   // Getter and setter for the lazy background page's keepalive count. This is
   // the count of how many outstanding "things" are keeping the page alive.
   // When this reaches 0, we will begin the process of shutting down the page.
   // "Things" include pending events, resource loads, and API calls.
-  // The |cancel_suspend| option defaults to false and indicates whether
-  // incrementing the keepalive count should prevent it from being suspended.
   int GetLazyKeepaliveCount(const extensions::Extension* extension);
-  int IncrementLazyKeepaliveCount(const extensions::Extension* extension,
-                                  ShouldCancelSuspend should_cancel_suspend);
+  int IncrementLazyKeepaliveCount(const extensions::Extension* extension);
   int DecrementLazyKeepaliveCount(const extensions::Extension* extension);
 
   void IncrementLazyKeepaliveCountForView(
       content::RenderViewHost* render_view_host);
 
   // Handles a response to the ShouldUnload message, used for lazy background
   // pages.
   void OnShouldUnloadAck(const std::string& extension_id, int sequence_id);
 
   // Same as above, for the Unload message.
   void OnUnloadAck(const std::string& extension_id);
 
   // Tracks network requests for a given RenderViewHost, used to know
   // when network activity is idle for lazy background pages.
   void OnNetworkRequestStarted(content::RenderViewHost* render_view_host);
   void OnNetworkRequestDone(content::RenderViewHost* render_view_host);
 
+  // Prevents |extension|'s background page from being closed and sends the
+  // onSuspendCanceled() event to it.
+  void CancelSuspend(const extensions::Extension* extension);
+
  protected:
   explicit ExtensionProcessManager(Profile* profile);
 
   // Called just after |host| is created so it can be registered in our lists.
   void OnExtensionHostCreated(ExtensionHost* host, bool is_background);
 
   // Called on browser shutdown to close our extension hosts.
   void CloseBackgroundHosts();
 
   // content::NotificationObserver:
@@ skipping 60 matching lines @@
   // The time to delay between sending a ShouldUnload message and
   // sending a Unload message; read from command-line switch.
   base::TimeDelta event_page_unloading_time_;
 
   base::WeakPtrFactory<ExtensionProcessManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionProcessManager);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_PROCESS_MANAGER_H_