Do not show apps section until default apps are installed.

chrome/browser/dom_ui/app_launcher_handler.cc

 // Copyright (c) 2010 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/dom_ui/app_launcher_handler.h"
 
 #include "app/animation.h"
 #include "base/metrics/histogram.h"
 #include "base/string_number_conversions.h"
 #include "base/string_split.h"
@@ skipping 168 matching lines @@
       list->Append(app_info);
     }
   }
   dictionary->Set("apps", list);
 
 #if defined(OS_MACOSX)
   // App windows are not yet implemented on mac.
   dictionary->SetBoolean("disableAppWindowLaunch", true);
   dictionary->SetBoolean("disableCreateAppShortcut", true);
 #endif
+
+  // We always show the launcher on Chrome OS. On Desktop Chrome, only show it
+  // if we've installed our default apps.
+#if defined(OS_CHROMEOS)
+  dictionary->SetBoolean("showLauncher", true);
+#else
+  dictionary->SetBoolean(
+      "showLauncher",
+      extensions_service_->default_apps()->GetDefaultAppsInstalled());
+#endif
 }
 
 void AppLauncherHandler::HandleGetApps(const ListValue* args) {
   DictionaryValue dictionary;
   FillAppDictionary(&dictionary);
 
   // Tell the client whether to show the promo for this view. We don't do this
   // in the case of PREF_CHANGED because:
   //
   // a) At that point in time, depending on the pref that changed, it can look
@@ skipping 202 matching lines @@
   // We make this check for the case of minimized windows, unit tests, etc.
   if (platform_util::IsVisible(dom_ui_->tab_contents()->GetNativeView()) &&
       Animation::ShouldRenderRichAnimation()) {
 #if defined(OS_WIN)
     AppLaunchedAnimation::Show(extension, rect);
 #else
     NOTIMPLEMENTED();
 #endif
   }
 }