cros: Bind hangup red button on remote controller to close web dialog

ui/web_dialogs/web_dialog_delegate.h

Index: ui/web_dialogs/web_dialog_delegate.h
diff --git a/ui/web_dialogs/web_dialog_delegate.h b/ui/web_dialogs/web_dialog_delegate.h
index 640dfd02ccee3a2010fe6f0db3c9760c0478aecd..be1ec9b04f75b5b9833649b169ce99429687370b 100644
--- a/ui/web_dialogs/web_dialog_delegate.h
+++ b/ui/web_dialogs/web_dialog_delegate.h
@@ -31,6 +31,7 @@ class Size;
 }
 
 namespace ui {
+class Accelerator;
 
 // Implement this class to receive notifications.
 class WEB_DIALOGS_EXPORT WebDialogDelegate {
@@ -137,6 +138,12 @@ class WEB_DIALOGS_EXPORT WebDialogDelegate {
   // Stores the dialog bounds.
   virtual void StoreDialogSize(const gfx::Size& dialog_size) {}
 
+  // Returns the accelerators handled by the delegate.
+  virtual std::vector<Accelerator> GetAccelerators();
+
+  // Returns true if |accelerator| is processed, otherwise false.
+  virtual bool AcceleratorPressed(const Accelerator& accelerator);
+
   virtual ~WebDialogDelegate() {}
 };