Restore screen work area after login

ash/shell/keyboard_controller_proxy_stub.cc

Index: ash/shell/keyboard_controller_proxy_stub.cc
diff --git a/ash/shell/keyboard_controller_proxy_stub.cc b/ash/shell/keyboard_controller_proxy_stub.cc
index 1e50ca6c92259727e4e5dc322e1c663370ba3a54..4a82ff1988dee814ad0e7879a703c4b77771c494 100644
--- a/ash/shell/keyboard_controller_proxy_stub.cc
+++ b/ash/shell/keyboard_controller_proxy_stub.cc
@@ -19,6 +19,10 @@ KeyboardControllerProxyStub::KeyboardControllerProxyStub() {
 KeyboardControllerProxyStub::~KeyboardControllerProxyStub() {
 }
 
+bool KeyboardControllerProxyStub::HasKeyboardWindow() const {
+  return keyboard_;
+}
+
 aura::Window* KeyboardControllerProxyStub::GetKeyboardWindow() {
   if (!keyboard_) {
     keyboard_.reset(new aura::Window(&delegate_));