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
+#if defined(USE_UTOUCH)
+      ui::TouchFactory::GetInstance()->ProcessXI2Event(xev);
+#endif  // USE_UTOUCH
+
       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 212 matching lines @@
       root_window_->ConvertPointToNativeScreen(&point);
       xevent.xmotion.x_root = point.x();
       xevent.xmotion.y_root = point.y();
     }
     default:
       break;
   }
   XSendEvent(xdisplay_, xwindow_, False, 0, &xevent);
 }
 
+aura::NativeHandle RootWindowHostLinux::GetNativeWindow() const {
+  return xwindow_;
+}
+
 bool RootWindowHostLinux::IsWindowManagerPresent() {
   // Per ICCCM 2.8, "Manager Selections", window managers should take ownership
   // of WM_Sn selections (where n is a screen number).
   ::Atom wm_s0_atom = XInternAtom(xdisplay_, "WM_S0", False);
   return XGetSelectionOwner(xdisplay_, wm_s0_atom) != None;
 }
 
 void RootWindowHostLinux::SetCursorInternal(gfx::NativeCursor cursor) {
   ::Cursor xcursor =
       cursor == kCursorNone ?
       invisible_cursor_ :
       ui::GetXCursor(CursorShapeFromNative(cursor));
   XDefineCursor(xdisplay_, xwindow_, xcursor);
 }
 
 // static
 RootWindowHost* RootWindowHost::Create(const gfx::Rect& bounds) {
   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