Add keyboard handler for mime-handler-view.

extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc

Index: extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
diff --git a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
index 41e076000f5b74660cef82ba4fa8b7c978f51ee4..5e5717c1b571766541789fe7188a70677d773715 100644
--- a/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
+++ b/extensions/browser/guest_view/mime_handler_view/mime_handler_view_guest.cc
@@ -94,4 +94,20 @@ void MimeHandlerViewGuest::DidAttachToEmbedder() {
       std::string());
 }
 
+void MimeHandlerViewGuest::HandleKeyboardEvent(
+    WebContents* source,
+    const content::NativeWebKeyboardEvent& event) {
+  if (!attached())
+    return;
+
+  // Send the keyboard events back to the embedder to reprocess them.
+  // TODO(fsamuel): This introduces the possibility of out-of-order keyboard
+  // events because the guest may be arbitrarily delayed when responding to
+  // keyboard events. In that time, the embedder may have received and processed
+  // additional key events. This needs to be fixed as soon as possible.

[lazyboy, 2014/09/08 21:48:36]

I'm not sure if the comment is relevant for mime-handler-view.

[Fady Samuel, 2014/09/08 21:51:38]

Yes, it is still relevant unfortunately.

+  // See http://crbug.com/229882.
+  embedder_web_contents()->GetDelegate()->HandleKeyboardEvent(web_contents(),
+                                                              event);
+}
+
 }  // namespace extensions