cros: Preload external extension icons.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 8c20453d0c69bd06cadbeb5aaa29e20b743c86fc..5ec034945b82614279367d470b991a2a864331af 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -2350,6 +2350,14 @@ bool ExtensionService::OnExternalExtensionFileFound(
   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