Update from https://crrev.com/306655

Includes updates to ui/ and mojo/services for cc and gpu changes and
a minor update to a unit test in sky/ for skia interface changes.

Review URL: https://codereview.chromium.org/761903003
diff --git a/build/landmine_utils.py b/build/landmine_utils.py
index 9b667d0..6d18b6d 100644
--- a/build/landmine_utils.py
+++ b/build/landmine_utils.py
@@ -33,7 +33,7 @@
 
 @memoize()
 def IsLinux():
-  return sys.platform.startswith(('linux', 'freebsd'))
+  return sys.platform.startswith(('linux', 'freebsd', 'openbsd'))
 
 
 @memoize()