Added checking for higher bit being set in GetAsyncKeyState return value.

content/browser/renderer_host/input/web_input_event_builders_win.cc

 // Copyright 2013 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 "content/browser/renderer_host/input/web_input_event_builders_win.h"
 
 #include "base/logging.h"
 #include "content/browser/renderer_host/input/web_input_event_util.h"
 
 using blink::WebInputEvent;
@@ skipping 321 matching lines @@
   GetKeyStateFunction get_key_state_func;
   UINT key_state;
   float wheel_delta;
   bool horizontal_scroll = false;
   if ((message == WM_VSCROLL) || (message == WM_HSCROLL)) {
     // Synthesize mousewheel event from a scroll event.  This is needed to
     // simulate middle mouse scrolling in some laptops.  Use GetAsyncKeyState
     // for key state since we are synthesizing the input event.
     get_key_state_func = GetAsyncKeyState;
     key_state = 0;
-    if (get_key_state_func(VK_SHIFT))
+    if (get_key_state_func(VK_SHIFT) & 0x8000)
       key_state |= MK_SHIFT;
-    if (get_key_state_func(VK_CONTROL))
+    if (get_key_state_func(VK_CONTROL) & 0x8000)
       key_state |= MK_CONTROL;
     // NOTE: There doesn't seem to be a way to query the mouse button state
     // in this case.
 
     POINT cursor_position = {0};
     GetCursorPos(&cursor_position);
     result.globalX = cursor_position.x;
     result.globalY = cursor_position.y;
 
     switch (LOWORD(wparam)) {
@@ skipping 98 matching lines @@
     result.wheelTicksX = wheel_delta;
   } else {
     result.deltaY = scroll_delta;
     result.wheelTicksY = wheel_delta;
   }
 
   return result;
 }
 
 }  // namespace content