Refactor ozone DrmDisplayHostManager for pluggable messaging

Modify DrmDisplayHostManager in Ozone so that messaging can be be
dynamically configured as IPC or thread-hop as will be needed
by MUS.

BUG=558602

Review URL: https://codereview.chromium.org/1587503002

Cr-Commit-Position: refs/heads/master@{#369568}
diff --git a/PRESUBMIT.py b/PRESUBMIT.py
index 4755771e..c89fbfa2 100644
--- a/PRESUBMIT.py
+++ b/PRESUBMIT.py
@@ -178,7 +178,7 @@
         r"^net[\\\/]url_request[\\\/]test_url_fetcher_factory\.cc$",
         r"^remoting[\\\/]host[\\\/]gnubby_auth_handler_posix\.cc$",
         r"^ui[\\\/]ozone[\\\/]platform[\\\/]drm[\\\/]host[\\\/]"
-            "drm_display_host_manager\.cc$",
+            "drm_display_host_manager_core\.cc$",
       ),
     ),
     (