Acknolwedged. Starting on this now.

It seems this is largely a manual process. I don't want to do anything silly, so if there's a tool to automate part or all of the conversion please let me know.

Need to add at least 3 mojom's under ui/display/types/mojo/ for:

display_constants.mojom (for enum DisplayConnectionType)
display_mode.mojom (for struct DisplayMode) 
display_snapshot.mojom (for struct DisplaySnapshot)

I think it's mostly manual. I suggest there be a ui/display/mojom directory for these. ui/gfx/geometry/mojo is probably a good example to look at.

rockot@ or yzhen@ (CC'ed here) are the best people for specific mojo questions. Mojo has been evolving rapidly so it's always worth asking.

rockot@ or yzhen@ -- I tried to follow ui/gfx/geometry/mojo to write mojom for //ui/display/types/display_*.h but got some presubmit warnings:

** Presubmit ERRORS **
Do not introduce new mojom targets with use_new_wrapper_types set to false. The mode is deprecated and will be removed soon.
  ui/display/mojo/BUILD.gn

What is this deal with deprecating use_new_wrapper_types? Thanks.

We just haven't gotten around to porting existing uses away from the old
wrappers
There's no good reason to use them for new targets.

hshi@ how is this coming?

re:#8 not much progress, I'm afraid, this is still in my backburner.

 Issue 682696  has been merged into this issue.

Thanh is going to take a look at this.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/e29136a35e8282ad38b3504915837eb26425918c

commit e29136a35e8282ad38b3504915837eb26425918c
Author: thanhph <thanhph@chromium.org>
Date: Wed Mar 08 16:24:46 2017

Write mojoms and StructTraits for DisplaySnapshot.

We need to enable communication between the mus window server and mus
gpu in the new split architecture of window server and gpu.

DisplaySnapShot is abstract so DisplaySnapshotMojo is created to
support mojom serialization/deserialization. Enum mojom and struct
traits are also added for DisplayConnectionType.

BUG= 649366 

Review-Url: https://codereview.chromium.org/2646213002
Cr-Commit-Position: refs/heads/master@{#455466}

[modify] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/BUILD.gn
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/display_snapshot_mojo.cc
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/display_snapshot_mojo.h
[modify] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/BUILD.gn
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_constants.mojom
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_constants.typemap
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_constants_struct_traits.cc
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_constants_struct_traits.h
[modify] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_mode.typemap
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_mode_struct_traits.cc
[modify] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_mode_struct_traits.h
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_snapshot_mojo.mojom
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_snapshot_mojo.typemap
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_snapshot_mojo_struct_traits.cc
[add] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_snapshot_mojo_struct_traits.h
[modify] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_struct_traits_test.mojom
[modify] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/display_struct_traits_unittest.cc
[modify] https://crrev.com/e29136a35e8282ad38b3504915837eb26425918c/ui/display/mojo/typemaps.gni