Chameleon: Move methods to client side and remove useless returns

This is a part of CLs that moves logic from server to client.
Now all the methods of DisplayClient simply dispatch to the RPC server,
except the methods which need non-native type arguments.

BUG=chromium:405143
TEST=Ran display_EdidStress and display_Resolution.mirrored passed.

Change-Id: I71b2891e951c523d15d173cd2eba26f6e3c13ab7
Reviewed-on: https://chromium-review.googlesource.com/226109
Reviewed-by: Hung-ying Tyan <tyanh@chromium.org>
Commit-Queue: Wai-Hong Tam <waihong@chromium.org>
Tested-by: Wai-Hong Tam <waihong@chromium.org>
2 files changed