Handle more browser commands in ash.

ash/shell/shell_delegate_impl.cc

Index: ash/shell/shell_delegate_impl.cc
diff --git a/ash/shell/shell_delegate_impl.cc b/ash/shell/shell_delegate_impl.cc
index 957852e95be948f08f3a7ab9f72cbc008f91db93..7890551fc3488903cc85213a8b9e443f5e33718d 100644
--- a/ash/shell/shell_delegate_impl.cc
+++ b/ash/shell/shell_delegate_impl.cc
@@ -56,6 +56,9 @@ void ShellDelegateImpl::Exit() {
   MessageLoopForUI::current()->Quit();
 }
 
+void ShellDelegateImpl::NewTab() {
+}
+
 void ShellDelegateImpl::NewWindow(bool incognito) {
   ash::shell::ToplevelWindow::CreateParams create_params;
   create_params.can_resize = true;
@@ -75,9 +78,15 @@ void ShellDelegateImpl::OpenCrosh() {
 void ShellDelegateImpl::OpenMobileSetup() {
 }
 
+void ShellDelegateImpl::RestoreTab() {
+}
+
 void ShellDelegateImpl::ShowKeyboardOverlay() {
 }
 
+void ShellDelegateImpl::ShowTaskManager() {
+}
+
 content::BrowserContext* ShellDelegateImpl::GetCurrentBrowserContext() {
   return Shell::GetInstance()->browser_context();
 }