Added third_party/khronos_glcts in preparation for new internal DEPS …

…entry.

BUG=414003

Review URL: https://codereview.chromium.org/712463002

Cr-Commit-Position: refs/heads/master@{#303145}

.gitignore

@@ -307,6 +307,7 @@ v8.log
 /third_party/jsoncpp/source
 /third_party/jsr-305/src
 /third_party/junit/src
+/third_party/khronos_glcts
 /third_party/leveldatabase/src
 /third_party/leveldb
 /third_party/libaddressinput/src