Supply X & Y deltas in the right order when creating new-style wheel events.

remoting/host/event_executor_mac.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 "remoting/host/event_executor.h"
 
 #include <ApplicationServices/ApplicationServices.h>
 #include <Carbon/Carbon.h>
 
 #include "base/basictypes.h"
@@ skipping 187 matching lines @@
 #pragma clang diagnostic pop
   if (error != kCGErrorSuccess) {
     LOG(WARNING) << "CGPostMouseEvent error " << error;
   }
 
   if (event.has_wheel_delta_x() && event.has_wheel_delta_y()) {
     int delta_x = static_cast<int>(event.wheel_delta_x());
     int delta_y = static_cast<int>(event.wheel_delta_y());
     base::mac::ScopedCFTypeRef<CGEventRef> event(
         CGEventCreateScrollWheelEvent(
-            NULL, kCGScrollEventUnitPixel, 2, delta_x, delta_y));
+            NULL, kCGScrollEventUnitPixel, 2, delta_y, delta_x));
     if (event)
       CGEventPost(kCGHIDEventTap, event);
   } else if (event.has_wheel_offset_x() && event.has_wheel_offset_y()) {
     int dx = event.wheel_offset_x();
     int dy = event.wheel_offset_y();
     // Note that |dy| (the vertical wheel) is the primary wheel.
 #pragma clang diagnostic push
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
     error = CGPostScrollWheelEvent(2, dy, dx);
 #pragma clang diagnostic pop
@@ skipping 32 matching lines @@
 
 }  // namespace
 
 scoped_ptr<EventExecutor> EventExecutor::Create(
     scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
     scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner) {
   return scoped_ptr<EventExecutor>(new EventExecutorMac(main_task_runner));
 }
 
 }  // namespace remoting