Fix direction of horizontal scroll when tilting the scroll wheel on Linux Aura

ui/events/x/events_x_unittest.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 <cstring>
 
 #include <X11/extensions/XInput2.h>
 #include <X11/Xlib.h>
 
 // Generically-named #defines from Xlib that conflict with symbols in GTest.
@@ skipping 71 matching lines @@
   EXPECT_LT(offset.y(), 0);
   EXPECT_EQ(0, offset.x());
 
   // Scroll left.
   InitButtonEvent(&event, true, location, 6, 0);
   EXPECT_EQ(ui::ET_MOUSEWHEEL, ui::EventTypeFromNative(&event));
   EXPECT_EQ(0, ui::EventFlagsFromNative(&event));
   EXPECT_EQ(location, ui::EventLocationFromNative(&event));
   offset = ui::GetMouseWheelOffset(&event);
   EXPECT_EQ(0, offset.y());
-  EXPECT_LT(offset.x(), 0);
+  EXPECT_GT(offset.x(), 0);
 
   // Scroll right.
   InitButtonEvent(&event, true, location, 7, 0);
   EXPECT_EQ(ui::ET_MOUSEWHEEL, ui::EventTypeFromNative(&event));
   EXPECT_EQ(0, ui::EventFlagsFromNative(&event));
   EXPECT_EQ(location, ui::EventLocationFromNative(&event));
   offset = ui::GetMouseWheelOffset(&event);
   EXPECT_EQ(0, offset.y());
-  EXPECT_GT(offset.x(), 0);
+  EXPECT_LT(offset.x(), 0);
 
   // TODO(derat): Test XInput code.
 }
 
 TEST(EventsXTest, AvoidExtraEventsOnWheelRelease) {
   XEvent event;
   gfx::Point location(5, 10);
 
   InitButtonEvent(&event, true, location, 4, 0);
   EXPECT_EQ(ui::ET_MOUSEWHEEL, ui::EventTypeFromNative(&event));
@@ skipping 120 matching lines @@
       0, XI_TouchEnd, 6, gfx::Point(200, 200), valuators);
   EXPECT_EQ(ui::ET_TOUCH_RELEASED, ui::EventTypeFromNative(scoped_xevent));
   EXPECT_EQ("200,200", ui::EventLocationFromNative(scoped_xevent).ToString());
   EXPECT_EQ(GetTouchId(scoped_xevent), 1);
   EXPECT_EQ(GetTouchRadiusX(scoped_xevent), 25);
   EXPECT_FLOAT_EQ(GetTouchAngle(scoped_xevent), 0.45f);
   EXPECT_FLOAT_EQ(GetTouchForce(scoped_xevent), 0.5f);
 }
 #endif
 }  // namespace ui