touch: Allow grabbing/ungrabbing touch devices for XInput2.

views/controls/menu/menu_host_gtk.cc

Index: views/controls/menu/menu_host_gtk.cc
diff --git a/views/controls/menu/menu_host_gtk.cc b/views/controls/menu/menu_host_gtk.cc
index 917ded3fd1ad55ee9943a8538bbb3ff2afcb25e8..6b29ce184cbf95596095785d9d4ba1a76f9a6c53 100644
--- a/views/controls/menu/menu_host_gtk.cc
+++ b/views/controls/menu/menu_host_gtk.cc
@@ -6,11 +6,20 @@
 
 #include <gdk/gdk.h>
 
+#if defined(HAVE_XINPUT2) && defined(TOUCH_UI)
+#include <gdk/gdkx.h>
+#include <X11/extensions/XInput2.h>
+#endif
+
 #include "views/controls/menu/menu_controller.h"
 #include "views/controls/menu/menu_host_root_view.h"
 #include "views/controls/menu/menu_item_view.h"
 #include "views/controls/menu/submenu_view.h"
 
+#if defined(HAVE_XINPUT2) && defined(TOUCH_UI)
+#include "views/touchui/touch_factory.h"
+#endif
+
 namespace views {
 
 // static
@@ -104,6 +113,10 @@ void MenuHostGtk::ReleaseGrab() {
     did_input_grab_ = false;
     gdk_pointer_ungrab(GDK_CURRENT_TIME);
     gdk_keyboard_ungrab(GDK_CURRENT_TIME);
+#if defined(HAVE_XINPUT2) && defined(TOUCH_UI)
+    TouchFactory::GetInstance()->UngrabTouchDevices(
+        GDK_WINDOW_XDISPLAY(window_contents()->window));
+#endif
   }
 }
 
@@ -151,6 +164,14 @@ void MenuHostGtk::DoCapture() {
 
   did_input_grab_ = pointer_grab_status == GDK_GRAB_SUCCESS &&
       keyboard_grab_status == GDK_GRAB_SUCCESS;
+
+#if defined(HAVE_XINPUT2) && defined(TOUCH_UI)
+  ::Window window = GDK_WINDOW_XID(window_contents()->window);
+  Display* display = GDK_WINDOW_XDISPLAY(window_contents()->window);
+  bool xi2grab = TouchFactory::GetInstance()->GrabTouchDevices(display, window);
+  did_input_grab_ = did_input_grab_ && xi2grab;
+#endif
+
   DCHECK(did_input_grab_);
   // need keyboard grab.
 }