Don't cache keystate if not blocked by UIPI

webkit/plugins/npapi/webplugin_delegate_impl_win.cc

 // Copyright (c) 2011 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 "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
 #include <map>
 #include <string>
 #include <vector>
 
@@ skipping 88 matching lines @@
 
 bool GetSavedKeyState(WPARAM vkey) {
   CHECK_LT(vkey, kBitsPerType * sizeof(g_saved_key_state));
   if (g_saved_key_state[vkey / kBitsPerType] & 1 << (vkey % kBitsPerType))
     return true;
   return false;
 }
 
 void SetSavedKeyState(WPARAM vkey) {
   CHECK_LT(vkey, kBitsPerType * sizeof(g_saved_key_state));
-  g_saved_key_state[vkey / kBitsPerType] |= 1 << (vkey % kBitsPerType);
+  // Cache the key state only for keys blocked by UIPI.
+  if (g_iat_orig_get_key_state(vkey) == 0)
+    g_saved_key_state[vkey / kBitsPerType] |= 1 << (vkey % kBitsPerType);
 }
 
 void UnsetSavedKeyState(WPARAM vkey) {
   CHECK_LT(vkey, kBitsPerType * sizeof(g_saved_key_state));
   g_saved_key_state[vkey / kBitsPerType] &= ~(1 << (vkey % kBitsPerType));
 }
 
 void ClearSavedKeyState() {
   memset(g_saved_key_state, 0, sizeof(g_saved_key_state));
 }
@@ skipping 1395 matching lines @@
       ::ReleaseCapture();
       break;
 
     default:
       break;
   }
 }
 
 }  // namespace npapi
 }  // namespace webkit