Add CSS as a source file type.

this forces license headers, no line-end whitespace, etc.

Also update the default license header regex to allow concluding */ on the final line.

Review URL: http://codereview.chromium.org/9109001

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@119448 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/presubmit_support.py b/presubmit_support.py
index f583fb6..5bd049b 100755
--- a/presubmit_support.py
+++ b/presubmit_support.py
@@ -198,7 +198,7 @@
       # Scripts
       r".+\.js$", r".+\.py$", r".+\.sh$", r".+\.rb$", r".+\.pl$", r".+\.pm$",
       # Other
-      r".+\.java$", r".+\.mk$", r".+\.am$",
+      r".+\.java$", r".+\.mk$", r".+\.am$", r".+\.css$"
   )
 
   # Path regexp that should be excluded from being considered containing source