This patch implements Chromium's Aura gesture recognizer in terms of utouch-grail and utouch-frame …

ui/aura/root_window_host_linux.cc

Index: ui/aura/root_window_host_linux.cc
===================================================================
--- ui/aura/root_window_host_linux.cc	(revision 126124)
+++ ui/aura/root_window_host_linux.cc	(working copy)
@@ -388,6 +388,16 @@
       if (!factory->ShouldProcessXI2Event(xev))
         break;
 
+      // Update utouch frame state
+      ui::TouchFactory::GetInstance()->ProcessXI2Event(xev);
+
+      // Update the device list if necessary.
+      if (xev->xgeneric.evtype == XI_HierarchyChanged) {
+        ui::UpdateDeviceList();
+        handled = true;
+        break;
+      }
+
       ui::EventType type = ui::EventTypeFromNative(xev);
       // If this is a motion event we want to coalesce all pending motion
       // events that are at the top of the queue.