Fix the issue of cursor's device scale factor when using monitors with differnt device scale factor.

ui/aura/ui_controls_x11.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 <X11/keysym.h>
 #include <X11/Xlib.h>
 
 // X macro fail.
 #if defined(RootWindow)
 #undef RootWindow
 #endif
 
 #include "base/logging.h"
 #include "base/message_pump_aurax11.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/ui_controls_aura.h"
 #include "ui/base/keycodes/keyboard_code_conversion_x.h"
+#include "ui/compositor/dip_util.h"
 #include "ui/ui_controls/ui_controls_aura.h"
 
 namespace aura {
 namespace {
 
 // Mask of the buttons currently down.
 unsigned button_down_mask = 0;
 
 // Event waiter executes the specified closure|when a matching event
 // is found.
@@ skipping 101 matching lines @@
   // Simulate a mouse move. (x,y) are absolute screen coordinates.
   virtual bool SendMouseMove(long x, long y) {
     return SendMouseMoveNotifyWhenDone(x, y, base::Closure());
   }
   virtual bool SendMouseMoveNotifyWhenDone(long x,
                                            long y,
                                            const base::Closure& closure) {
     XEvent xevent = {0};
     XMotionEvent* xmotion = &xevent.xmotion;
     xmotion->type = MotionNotify;
-    g_current_x = xmotion->x = x;
-    g_current_y = xmotion->y = y;
+    gfx::Point point = ui::ConvertPointToPixel(
+        root_window_->layer(),
+        gfx::Point(static_cast<int>(x), static_cast<int>(y)));
+    g_current_x = xmotion->x = point.x();
+    g_current_y = xmotion->y = point.y();
     xmotion->state = button_down_mask;
     xmotion->same_screen = True;
     // RootWindow will take care of other necessary fields.
     root_window_->PostNativeEvent(&xevent);
     RunClosureAfterAllPendingUIEvents(closure);
     return true;
   }
   virtual bool SendMouseEvents(ui_controls::MouseButton type, int state) {
     return SendMouseEventsNotifyWhenDone(type, state, base::Closure());
   }
@@ skipping 79 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(UIControlsX11);
 };
 
 }  // namespace
 
 ui_controls::UIControlsAura* CreateUIControlsAura(RootWindow* root_window) {
   return new UIControlsX11(root_window);
 }
 
 }  // namespace aura