Combine the WM_CHAR with WM_KEY* for key event flow.

ui/base/ui_base_switches.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/base/ui_base_switches.h"
 
 namespace switches {
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 // Fall back to using CAOpenGLLayers display content, instead of the IOSurface
 // based overlay display path.
 const char kDisableMacOverlays[] = "disable-mac-overlays";
 
 // Disable use of cross-process CALayers to display content directly from the
 // GPU process on Mac.
 const char kDisableRemoteCoreAnimation[] = "disable-remote-core-animation";
 
 // Show borders around CALayers corresponding to overlays and partial damage.
 const char kShowMacOverlayBorders[] = "show-mac-overlay-borders";
 #endif
 
+#if defined(OS_WIN)
+// Disables merging the key event (WM_KEY*) with the char event (WM_CHAR).
+const char kDisableMergeKeyCharEvents[]     = "disable-merge-key-char-events";
+
+// Enables merging the key event (WM_KEY*) with the char event (WM_CHAR).
+const char kEnableMergeKeyCharEvents[]     = "enable-merge-key-char-events";
+#endif
+
 // Disables use of DWM composition for top level windows.
 const char kDisableDwmComposition[] = "disable-dwm-composition";
 
 // Disables large icons on the New Tab page.
 const char kDisableIconNtp[] = "disable-icon-ntp";
 
 // Disables touch adjustment.
 const char kDisableTouchAdjustment[] = "disable-touch-adjustment";
 
 // Disables touch event based drag and drop.
@@ skipping 39 matching lines @@
 
 // Classic, non-material, mode for the |kTopChromeMD| switch.
 const char kTopChromeMDNonMaterial[] = "";
 #endif  // defined(ENABLE_TOPCHROME_MD)
 
 // On Windows only: requests that Chrome connect to the running Metro viewer
 // process.
 const char kViewerConnect[] = "connect-to-metro-viewer";
 
 }  // namespace switches