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

ui/aura/root_window_host_linux.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/aura/root_window_host_linux.h"
 
 #include <X11/cursorfont.h>
 #include <X11/extensions/XInput2.h>
 #include <algorithm>
 
@@ skipping 370 matching lines @@
       if (size_changed)
         root_window_->OnHostResized(bounds.size());
       handled = true;
       break;
     }
     case GenericEvent: {
       ui::TouchFactory* factory = ui::TouchFactory::GetInstance();
       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.
       XEvent last_event;
       int num_coalesced = 0;
 
       switch (type) {
         case ui::ET_TOUCH_PRESSED:
         case ui::ET_TOUCH_RELEASED:
         case ui::ET_TOUCH_MOVED: {
@@ skipping 239 matching lines @@
   return new RootWindowHostLinux(bounds);
 }
 
 // static
 gfx::Size RootWindowHost::GetNativeScreenSize() {
   ::Display* xdisplay = base::MessagePumpX::GetDefaultXDisplay();
   return gfx::Size(DisplayWidth(xdisplay, 0), DisplayHeight(xdisplay, 0));
 }
 
 }  // namespace aura