Delay Input.dispatchKeyEvent response until after key event ack.

content/public/browser/native_web_keyboard_event.h

Index: content/public/browser/native_web_keyboard_event.h
diff --git a/content/public/browser/native_web_keyboard_event.h b/content/public/browser/native_web_keyboard_event.h
index c31681e864977227cba52c28a19fe8e5d3b8d3e9..7ede8fd9a075a2d950f99faca36e54da05912b32 100644
--- a/content/public/browser/native_web_keyboard_event.h
+++ b/content/public/browser/native_web_keyboard_event.h
@@ -62,6 +62,10 @@ struct CONTENT_EXPORT NativeWebKeyboardEvent :
   // it is hit in ime mode.
   // Currently, it's only used by Linux and Mac ports.
   bool skip_in_browser;
+
+  // True if the event was generated by a call to DevTools
+  // (Input.dispatchKeyEvent), rather than in response to a user's keypress.
+  bool is_synthetic;
 };
 
 }  // namespace content