Add mojom::DisplayController.
Add a new mojo interface mojom::DisplayController to allow privileged
clients to make changes to the display state. The initial interface
contains methods needed by mash to provide display state related
keyboard accelerators that exist in cash currently.
Have PlatformScreenOzone implement this new interface and provide mostly
stub implementations. Right now the interface isn't wired up so that
will happen in a subsequent CL.
Also adds PlatformScreen::GetInstance() so PlatformScreen doesn't need
to be passed so many places.
BUG=611475
Review-Url: https://codereview.chromium.org/2310133002
Cr-Commit-Position: refs/heads/master@{#417578}
16 files changed
