Fixes forgotten rename of -XdisplayNameMode SDM parameter

Change-Id: Ib6bb8a8f0558059b813650beee055b845262a10a
(cherry picked from commit 35e7e6439e896378cf3c871cfa04a0732bbee8bb)
Fix bug with external at-rule using a prefix.

Fix a bug where style classes that match a external prefix and
that aren't associated to a method of the CssResource interface
were considered as non external.

Bug: issue 8960
Change-Id: Idc58856831c892ec13a011cc2eb0037236c2ae7e
(cherry picked from commit 66ffe2af8379d68299b296b0e750022b95ac65a6)