Get horizontal wheel scrolling working again with logitech drivers.

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 <oleacc.h>
 #include <shellapi.h>
 #include <wtsapi32.h>
@@ skipping 341 matching lines @@
       last_monitor_(NULL),
       use_layered_buffer_(false),
       layered_alpha_(255),
       waiting_for_redraw_layered_window_contents_(false),
       is_first_nccalc_(true),
       menu_depth_(0),
       autohide_factory_(this),
       id_generator_(0),
       needs_scroll_styles_(false),
       in_size_loop_(false),
-      touch_down_context_(false) {
+      touch_down_context_(false),
+      last_mouse_hwheel_time_(0) {
 }
 
 HWNDMessageHandler::~HWNDMessageHandler() {
   delegate_ = NULL;
   // Prevent calls back into this class via WNDPROC now that we've been
   // destroyed.
   ClearUserData();
 }
 
 void HWNDMessageHandler::Init(HWND parent, const gfx::Rect& bounds) {
@@ skipping 1935 matching lines @@
     if (message != WM_MOUSEWHEEL && message != WM_MOUSEHWHEEL) {
       POINT screen_point = CR_POINT_INITIALIZER_FROM_LPARAM(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)
       return 0;
   }
 
+  // Certain logitech drivers send the WM_MOUSEHWHEEL message to the parent
+  // followed by WM_MOUSEWHEEL messages to the child window causing a vertical
+  // scroll. We treat these WM_MOUSEWHEEL messages as WM_MOUSEHWHEEL
+  // messages.
+  if (message == WM_MOUSEHWHEEL)
+    last_mouse_hwheel_time_ = ::GetMessageTime();
+
+  if (message == WM_MOUSEWHEEL &&
+      ::GetMessageTime() == last_mouse_hwheel_time_) {
+    message = WM_MOUSEHWHEEL;
+  }
+
   if (message == WM_RBUTTONUP && is_right_mouse_pressed_on_caption_) {
     is_right_mouse_pressed_on_caption_ = false;
     ReleaseCapture();
     // |point| is in window coordinates, but WM_NCHITTEST and TrackPopupMenu()
     // expect screen coordinates.
     POINT screen_point = CR_POINT_INITIALIZER_FROM_LPARAM(l_param);
     MapWindowPoints(hwnd(), HWND_DESKTOP, &screen_point, 1);
     w_param = SendMessage(hwnd(), WM_NCHITTEST, 0,
                           MAKELPARAM(screen_point.x, screen_point.y));
     if (w_param == HTCAPTION || w_param == HTSYSMENU) {
@@ skipping 94 matching lines @@
     POINT cursor_pos = {0};
     ::GetCursorPos(&cursor_pos);
     if (memcmp(&cursor_pos, &mouse_location, sizeof(POINT)))
       return false;
     return true;
   }
   return false;
 }
 
 }  // namespace views