cros: Preload external extension icons.

chrome/browser/extensions/extension_service.cc

 // 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.
 
 #include "chrome/browser/extensions/extension_service.h"
 
 #include <algorithm>
 #include <set>
 
 #include "base/basictypes.h"
@@ skipping 2332 matching lines @@
     return false;
   }
 
   // no client (silent install)
   scoped_refptr<CrxInstaller> installer(CrxInstaller::Create(this, NULL));
   installer->set_install_source(location);
   installer->set_expected_id(id);
   installer->set_expected_version(*version);
   installer->set_install_cause(extension_misc::INSTALL_CAUSE_EXTERNAL_FILE);
   installer->set_creation_flags(creation_flags);
+#if defined(OS_CHROMEOS)
+  // Preload default app icons so that they could be display timely in launcher
+  // bar. See http://crbug.com/146114
+  const int kLauncherIconSizes[] = { 32, 64 };
+  installer->set_preload_sizes(
+      std::set<int>(kLauncherIconSizes,
+                    kLauncherIconSizes + arraysize(kLauncherIconSizes)));
+#endif
   installer->InstallCrx(path);
 
   // Depending on the source, a new external extension might not need a user
   // notification on installation. For such extensions, mark them acknowledged
   // now to suppress the notification.
   if (mark_acknowledged)
     AcknowledgeExternalExtension(id);
 
   return true;
 }
@@ skipping 302 matching lines @@
                                 extension_host->extension(),
                                 NULL, FilePath());
 #endif
 }
 
 void ExtensionService::InspectExtensionHost(
     extensions::ExtensionHost* host) {
   if (host)
     DevToolsWindow::OpenDevToolsWindow(host->render_view_host());
 }