Combine the WM_CHAR with WM_KEY* for key event flow.

base/base_switches.cc

Index: base/base_switches.cc
diff --git a/base/base_switches.cc b/base/base_switches.cc
index 7f3be7f516c58dd961ae699f81bba848651cbbe7..01673c2c4074272b56199e6076288fc8a3bbd471 100644
--- a/base/base_switches.cc
+++ b/base/base_switches.cc
@@ -68,8 +68,14 @@ const char kProfilerTiming[]                = "profiler-timing";
 const char kProfilerTimingDisabledValue[]   = "0";
 
 #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";
+
 // Disables the USB keyboard detection for blocking the OSK on Win8+.
 const char kDisableUsbKeyboardDetect[]      = "disable-usb-keyboard-detect";
+
+// Enables merging the key event (WM_KEY*) with the char event (WM_CHAR).
+const char kEnableMergeKeyCharEvents[]     = "enable-merge-key-char-events";
 #endif
 
 #if defined(OS_POSIX)