make "reload" on chrome://extensions automatically relaunch running apps

chrome/browser/ui/webui/extensions/extension_settings_handler.h

Index: chrome/browser/ui/webui/extensions/extension_settings_handler.h
diff --git a/chrome/browser/ui/webui/extensions/extension_settings_handler.h b/chrome/browser/ui/webui/extensions/extension_settings_handler.h
index bbe504d95f9195107903d95611652f11794bf31b..7785e601956439dcc44f9d4b51445ca63613d030 100644
--- a/chrome/browser/ui/webui/extensions/extension_settings_handler.h
+++ b/chrome/browser/ui/webui/extensions/extension_settings_handler.h
@@ -10,6 +10,7 @@
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_uninstall_dialog.h"
 #include "chrome/browser/extensions/extension_warning_set.h"
@@ -104,6 +105,9 @@ class ExtensionSettingsHandler : public content::WebUIMessageHandler,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
+  // Launches the application described by |extension_id|.
+  void LaunchApplication(extensions::ExtensionHost* extension_host);
+
   // ExtensionUninstallDialog::Delegate implementation, used for receiving
   // notification about uninstall confirmation dialog selections.
   virtual void ExtensionUninstallAccepted() OVERRIDE;
@@ -112,6 +116,9 @@ class ExtensionSettingsHandler : public content::WebUIMessageHandler,
   // Helper method that reloads all unpacked extensions.
   void ReloadUnpackedExtensions();
 
+  // Reloads the given extension.
+  void ReloadExtension(const extensions::Extension* extension);
+
   // Callback for "requestExtensionsData" message.
   void HandleRequestExtensionsData(const base::ListValue* args);
 
@@ -212,11 +219,21 @@ class ExtensionSettingsHandler : public content::WebUIMessageHandler,
   // we do so only once.
   bool registered_for_notifications_;
 
+  // The set of apps for which we have triggered reload. They will be
+  // re-launched when loaded again. The boolean tracks whether they have been
+  // enabled (whether NOTIFICATION_EXTENSION_ENABLED has been dispatched). This
+  // hack is necessary because reloading an extension causes multiple LOADED
+  // notifications, but we only care about the one that comes after ENABLED.
+  typedef std::map<std::string, bool> RelaunchApps;
+  RelaunchApps relaunch_app_ids_;
+
   content::NotificationRegistrar registrar_;
 
   PrefChangeRegistrar pref_registrar_;
   PrefChangeRegistrar local_state_pref_registrar_;
 
+  base::WeakPtrFactory<ExtensionSettingsHandler> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(ExtensionSettingsHandler);
 };