Disable XI2.0 multi-touch support in Aura

ui/base/touch/touch_factory.cc

 // Copyright (c) 2011 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/base/touch/touch_factory.h"
 
 #include <X11/cursorfont.h>
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/extensions/XIproto.h>
@@ skipping 419 matching lines @@
         valuator_lookup_[info->deviceid][j] = valuator->number;
         touch_param_min_[info->deviceid][j] = valuator->min;
         touch_param_max_[info->deviceid][j] = valuator->max;
       }
     }
 
 #if !defined(USE_XI2_MT)
     // In order to support multi-touch with XI2.0, we need both a slot_id and
     // tracking_id valuator.  Without these we'll treat the device as a
     // single-touch device (like a mouse).
-    if (valuator_lookup_[info->deviceid][TP_SLOT_ID] == -1 ||
-        valuator_lookup_[info->deviceid][TP_TRACKING_ID] == -1) {
+    // TODO(rbyers): Multi-touch is disabled: http://crbug.com/112329
+    //if (valuator_lookup_[info->deviceid][TP_SLOT_ID] == -1 ||
+    //    valuator_lookup_[info->deviceid][TP_TRACKING_ID] == -1) {
       DVLOG(1) << "Touch device " << info->deviceid <<
         " does not provide enough information for multi-touch, treating as "
         "a single-touch device.";
       touch_device_list_[info->deviceid] = false;
-    }
+    //}
 #endif
   }
 
   if (info_list)
     XIFreeDeviceInfo(info_list);
 }
 
 bool TouchFactory::ExtractTouchParam(const XEvent& xev,
                                      TouchParam tp,
                                      float* value) {
@@ skipping 36 matching lines @@
                                       float* max) {
   if (valuator_lookup_[deviceid][tp] >= 0) {
     *min = touch_param_min_[deviceid][tp];
     *max = touch_param_max_[deviceid][tp];
     return true;
   }
   return false;
 }
 
 }  // namespace ui