Add license check suppression for EGL extension header

Add a license check suppression for gpu/EGL/eglext.h which got added in a
recent commit. This is temporary fix and will be remedied by moving all the
Khronos headers under gpu to third_party -- See
http://code.google.com/p/chromium/issues/detail?id=98097.

BUG=98097
TEST=


Review URL: http://codereview.chromium.org/8343028

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@107641 0039d316-1c4b-4281-b951-d872f2087c98

tools/checklicenses/checklicenses.py

@@ -127,6 +127,9 @@ PATH_SPECIFIC_WHITELISTED_LICENSES = {
     'gpu/gles2_conform_support/egl/native/EGL': [
         'UNKNOWN',
     ],
+    'gpu/EGL': [
+        'UNKNOWN',
+    ],
 
     'native_client': [  # http://crbug.com/98099
         'UNKNOWN',