Combine the WM_CHAR with WM_KEY* for key event flow.

ui/metro_viewer/metro_viewer_messages.h

Index: ui/metro_viewer/metro_viewer_messages.h
diff --git a/ui/metro_viewer/metro_viewer_messages.h b/ui/metro_viewer/metro_viewer_messages.h
index ad7690cceda3a06746c2cafe4cd889efbec3d66a..97b1b41d83391be58d6a3d3642279bd67d34a9a1 100644
--- a/ui/metro_viewer/metro_viewer_messages.h
+++ b/ui/metro_viewer/metro_viewer_messages.h
@@ -61,6 +61,11 @@ IPC_MESSAGE_CONTROL4(MetroViewerHostMsg_Character,
                      uint32,       /* repeat count */
                      uint32,       /* scan code */
                      uint32        /* key state */);
+IPC_MESSAGE_CONTROL4(MetroViewerHostMsg_CharacterForNextKeyEvent,
+                     uint32,       /* virtual key */
+                     uint32,       /* repeat count */
+                     uint32,       /* scan code */
+                     uint32        /* key state */);
 // Informs the browser that the Metro window has been activated.
 IPC_MESSAGE_CONTROL1(MetroViewerHostMsg_WindowActivated,
                      bool /* Whether the window should be repainted */);