cros: Allow JS to control virtual keyboard on sign-in screen.

chrome/browser/chromeos/login/ui/webui_login_view.h

Index: chrome/browser/chromeos/login/ui/webui_login_view.h
diff --git a/chrome/browser/chromeos/login/ui/webui_login_view.h b/chrome/browser/chromeos/login/ui/webui_login_view.h
index 59006f9bbbf8d48a35c76fd5bed5481dacd4ae7b..0fc9684b1712894dbfdb26a352bf3db7fb769c5b 100644
--- a/chrome/browser/chromeos/login/ui/webui_login_view.h
+++ b/chrome/browser/chromeos/login/ui/webui_login_view.h
@@ -8,6 +8,7 @@
 #include <map>
 #include <string>
 
+#include "ash/shell_observer.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/observer_list.h"
@@ -16,6 +17,7 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/web_contents_delegate.h"
+#include "ui/keyboard/keyboard_controller_observer.h"
 #include "ui/views/controls/webview/unhandled_keyboard_event_handler.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
@@ -38,6 +40,8 @@ class OobeUI;
 // View used to render a WebUI supporting Widget. This widget is used for the
 // WebUI based start up and lock screens. It contains a WebView.
 class WebUILoginView : public views::View,
+                       public ash::ShellObserver,
+                       public keyboard::KeyboardControllerObserver,
                        public content::WebContentsDelegate,
                        public content::NotificationObserver,
                        public ChromeWebModalDialogManagerDelegate,
@@ -135,6 +139,14 @@ class WebUILoginView : public views::View,
   // Map type for the accelerator-to-identifier map.
   typedef std::map<ui::Accelerator, std::string> AccelMap;
 
+  // ash::ShellObserver:
+  void OnVirtualKeyboardStateChanged(bool activated,
+                                     ash::WmWindow* root_window) override;
+
+  // keyboard::KeyboardControllerObserver:
+  void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
+  void OnKeyboardClosed() override;
+
   // Overridden from content::WebContentsDelegate.
   bool HandleContextMenu(const content::ContextMenuParams& params) override;
   void HandleKeyboardEvent(