Add liblouis to third_party.

liblouis is a braille translation library that is used inside the
ChromeVox extension, where it is included as a native client binary.

This adjust the lincense check scripts for the headers used in this library.

BUG=303795,316353

Review URL: https://codereview.chromium.org/35683004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234051 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/DEPS b/DEPS
index fb30d57..14741e7 100644
--- a/DEPS
+++ b/DEPS
@@ -459,6 +459,11 @@
 
     "src/third_party/undoview":
       "/trunk/deps/third_party/undoview@119694",
+
+    "src/third_party/liblouis/src":
+      Var("chromium_git") +
+      "/external/liblouis.git@3c2daee56250162e5a75830871601d74328d39f5",
+
   },
   "android": {
     "src/third_party/android_tools":