Allow synthesized WM_MOUSEMOVE and WM_MOUSELEAVE messages for touch based input through.

ui/views/win/hwnd_message_handler.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/views/win/hwnd_message_handler.h"
 
 #include <dwmapi.h>
 #include <shellapi.h>
 
 #include "base/bind.h"
@@ skipping 1494 matching lines @@
   if (GetWindowLong(hwnd(), GWL_EXSTYLE) & WS_EX_NOACTIVATE)
     return MA_NOACTIVATE;
   SetMsgHandled(FALSE);
   return MA_ACTIVATE;
 }
 
 LRESULT HWNDMessageHandler::OnMouseRange(UINT message,
                                          WPARAM w_param,
                                          LPARAM l_param) {
 #if defined(USE_AURA)
-  if (!touch_ids_.empty())
+  if (!touch_ids_.empty() && message != WM_MOUSEMOVE &&
+      message != WM_MOUSELEAVE) {
     return 0;
+  }
   // We handle touch events on Windows Aura. Windows generates synthesized
   // mouse messages in response to touch which we should ignore. However touch
   // messages are only received for the client area. We need to ignore the
   // synthesized mouse messages for all points in the client area and places
   // which return HTNOWHERE.
-  if (ui::IsMouseEventFromTouch(message)) {
+  if (message != WM_MOUSEMOVE && message != WM_MOUSELEAVE &&
+      ui::IsMouseEventFromTouch(message)) {
     LPARAM l_param_ht = l_param;
     // For mouse events (except wheel events), location is in window coordinates
     // and should be converted to screen coordinates for WM_NCHITTEST.
     if (message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL) {
       CPoint screen_point(l_param_ht);
       MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
       l_param_ht = MAKELPARAM(screen_point.x, screen_point.y);
     }
     LRESULT hittest = SendMessage(hwnd(), WM_NCHITTEST, 0, l_param_ht);
     if (hittest == HTCLIENT || hittest == HTNOWHERE)
@@ skipping 708 matching lines @@
   SetMsgHandled(FALSE);
 }
 
 void HWNDMessageHandler::HandleTouchEvents(const TouchEvents& touch_events) {
   base::WeakPtr<HWNDMessageHandler> ref(weak_factory_.GetWeakPtr());
   for (size_t i = 0; i < touch_events.size() && ref; ++i)
     delegate_->HandleTouchEvent(touch_events[i]);
 }
 
 }  // namespace views