Warm-up the App List when enabled from the webstore and not shown.

chrome/browser/ui/ash/app_list/app_list_service_ash.cc

Index: chrome/browser/ui/ash/app_list/app_list_service_ash.cc
diff --git a/chrome/browser/ui/ash/app_list/app_list_service_ash.cc b/chrome/browser/ui/ash/app_list/app_list_service_ash.cc
index cf10ee6a3396e94f5e09f00b61364fffcf6660ae..1e9d69f29b0bb91ec2a6eeccffb739448f76ca65 100644
--- a/chrome/browser/ui/ash/app_list/app_list_service_ash.cc
+++ b/chrome/browser/ui/ash/app_list/app_list_service_ash.cc
@@ -28,6 +28,7 @@ class AppListServiceAsh : public AppListServiceImpl {
   // AppListService overrides:
   virtual base::FilePath GetProfilePath(
       const base::FilePath& user_data_dir) OVERRIDE;
+  virtual void CreateForProfile(Profile* default_profile) OVERRIDE;
   virtual void ShowForProfile(Profile* default_profile) OVERRIDE;
   virtual bool IsAppListVisible() const OVERRIDE;
   virtual void DismissAppList() OVERRIDE;
@@ -42,6 +43,8 @@ base::FilePath AppListServiceAsh::GetProfilePath(
   return ChromeLauncherController::instance()->profile()->GetPath();
 }
 
+void AppListServiceAsh::CreateForProfile(Profile* default_profile) {}
+
 void AppListServiceAsh::ShowForProfile(Profile* default_profile) {
   // This may not work correctly if the profile passed in is different from the
   // one the ash Shell is currently using.