Add the ability to load multiple apps into app_shell.

extensions/shell/browser/shell_extension_system.cc

Index: extensions/shell/browser/shell_extension_system.cc
diff --git a/extensions/shell/browser/shell_extension_system.cc b/extensions/shell/browser/shell_extension_system.cc
index 317a410030ca6afbb01b8314e788b990c7d24098..6337108ccb297b4bd170d950cfeb00cd58d911d6 100644
--- a/extensions/shell/browser/shell_extension_system.cc
+++ b/extensions/shell/browser/shell_extension_system.cc
@@ -37,21 +37,20 @@ ShellExtensionSystem::ShellExtensionSystem(BrowserContext* browser_context)
 ShellExtensionSystem::~ShellExtensionSystem() {
 }
 
-bool ShellExtensionSystem::LoadApp(const base::FilePath& app_dir) {
+const Extension* ShellExtensionSystem::LoadApp(const base::FilePath& app_dir) {
   // app_shell only supports unpacked extensions.
   // NOTE: If you add packed extension support consider removing the flag
   // FOLLOW_SYMLINKS_ANYWHERE below. Packed extensions should not have symlinks.
   CHECK(base::DirectoryExists(app_dir)) << app_dir.AsUTF8Unsafe();
   int load_flags = Extension::FOLLOW_SYMLINKS_ANYWHERE;
   std::string load_error;
-  extension_ = file_util::LoadExtension(
+  scoped_refptr<Extension> extension = file_util::LoadExtension(
       app_dir, Manifest::COMMAND_LINE, load_flags, &load_error);
-  if (!extension_.get()) {
+  if (!extension.get()) {
     LOG(ERROR) << "Loading extension at " << app_dir.value()
                << " failed with: " << load_error;
-    return false;
+    return nullptr;
   }
-  app_id_ = extension_->id();
 
   // TODO(jamescook): We may want to do some of these things here:
   // * Create a PermissionsUpdater.
@@ -60,29 +59,36 @@ bool ShellExtensionSystem::LoadApp(const base::FilePath& app_dir) {
   // * Call ExtensionPrefs::OnExtensionInstalled().
   // * Send NOTIFICATION_EXTENSION_WILL_BE_INSTALLED_DEPRECATED.
 
-  ExtensionRegistry::Get(browser_context_)->AddEnabled(extension_);
+  ExtensionRegistry::Get(browser_context_)->AddEnabled(extension.get());
 
-  RegisterExtensionWithRequestContexts(extension_.get());
+  RegisterExtensionWithRequestContexts(extension.get());
 
   content::NotificationService::current()->Notify(
       extensions::NOTIFICATION_EXTENSION_LOADED_DEPRECATED,
       content::Source<BrowserContext>(browser_context_),
-      content::Details<const Extension>(extension_.get()));
+      content::Details<const Extension>(extension.get()));
 
+  return extension.get();
+}
+
+void ShellExtensionSystem::Init() {
   // Inform the rest of the extensions system to start.
   ready_.Signal();
   content::NotificationService::current()->Notify(
       extensions::NOTIFICATION_EXTENSIONS_READY_DEPRECATED,
       content::Source<BrowserContext>(browser_context_),
       content::NotificationService::NoDetails());
-  return true;
 }
 
-void ShellExtensionSystem::LaunchApp() {
+void ShellExtensionSystem::LaunchApp(const ExtensionId& extension_id) {
   // Send the onLaunched event.
-  DCHECK(extension_.get());
-  AppRuntimeEventRouter::DispatchOnLaunchedEvent(browser_context_,
-                                                 extension_.get());
+  DCHECK(ExtensionRegistry::Get(browser_context_)
+             ->enabled_extensions()
+             .Contains(extension_id));
+  const Extension* extension = ExtensionRegistry::Get(browser_context_)
+                                   ->enabled_extensions()
+                                   .GetByID(extension_id);
+  AppRuntimeEventRouter::DispatchOnLaunchedEvent(browser_context_, extension);
 }
 
 void ShellExtensionSystem::Shutdown() {