Combine the WM_CHAR with WM_KEY* for key event flow.

base/message_loop/message_pump_win.cc

Index: base/message_loop/message_pump_win.cc
diff --git a/base/message_loop/message_pump_win.cc b/base/message_loop/message_pump_win.cc
index 10e308aa9dc3406ad5d1f02c5edca8e6a83573c9..e141c7cdb1b11236d5c56ee338364249bbf9bf49 100644
--- a/base/message_loop/message_pump_win.cc
+++ b/base/message_loop/message_pump_win.cc
@@ -400,10 +400,12 @@ bool MessagePumpForUI::ProcessMessageHelper(const MSG& msg) {
   }
   if (action & MessagePumpDispatcher::POST_DISPATCH_QUIT_LOOP)
     state_->should_quit = true;
-  if (action & MessagePumpDispatcher::POST_DISPATCH_PERFORM_DEFAULT) {
-    TranslateMessage(&msg);
+  // Don't call TranslateMessage() here but call TranslateMessage() in
+  // InputMethodWin, so that the WM_KEYDOWN/WM_KEYUP & WM_CHAR can be combined
+  // for key event flow. The combination of key events is required for Chrome
+  // IMEs, which can do IME related actions based on the single key event.
+  if (action & MessagePumpDispatcher::POST_DISPATCH_PERFORM_DEFAULT)
     DispatchMessage(&msg);
-  }
 
   return true;
 }