Mojom compiler: Improves error message by giving misspelled identifier.

Mojom compiler: Improves error message by giving misspelled identifier.

Instead of printing a meaningless Python object ID and a cryptic Python error print "unrecognized kind" and the type-spec for the unrecognized kind.

This came up for me when I was writing a longer .mojom file and I had misspelled the name of one of my structs when I was attempting to include the struct in a union. The compiler told me something was wrong but I had no idea which identifier I had misspelled.

R=azani@chromium.org

Committed: https://chromium.googlesource.com/external/mojo/+/ae32942fcbd444484021dab26ccc508e0e1d52ce

[rudominer, 2015-08-17 03:30:39]

rudominer@chromium.org changed reviewers:
+ azani@chromium.org

[azani, 2015-08-17 08:50:28]

lgtm

Let's maybe add a TODO to remove it once we have re-written the front-end and
included such a check before hitting the code generators?

[rudominer, 2015-08-17 16:19:15]

Committed patchset #2 (id:20001) manually as
ae32942fcbd444484021dab26ccc508e0e1d52ce (presubmit successful).