Thrift: Merging external patch.

Summary:
Merging a patch from Andy Lutomirsky.
- Allow fields to be marked "required" or "optional" (only affects C++).
- Thrift structs now have operator ==.

Reviewed By: mcslee

Test Plan: test/OptionalRequiredTest.cpp

Revert Plan: ok


git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@665202 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/thrift.el b/thrift.el
index 20ee915..4abb04e 100644
--- a/thrift.el
+++ b/thrift.el
@@ -10,7 +10,7 @@
 (defconst thrift-font-lock-keywords
   (list
    '("#.*$" . font-lock-comment-face)  ;; perl style comments
-   '("\\<\\(include\\|struct\\|exception\\|typedef\\|cpp_namespace\\|java_package\\|php_namespace\\|const\\|enum\\|service\\|extends\\|void\\|async\\|throws\\)\\>" . font-lock-keyword-face)  ;; keywords
+   '("\\<\\(include\\|struct\\|exception\\|typedef\\|cpp_namespace\\|java_package\\|php_namespace\\|const\\|enum\\|service\\|extends\\|void\\|async\\|throws\\|optional\\|required\\)\\>" . font-lock-keyword-face)  ;; keywords
    '("\\<\\(bool\\|byte\\|i16\\|i32\\|i64\\|double\\|string\\|binary\\|map\\|list\\|set\\)\\>" . font-lock-type-face)  ;; built-in types
    '("\\<\\([0-9]+\\)\\>" . font-lock-variable-name-face)   ;; ordinals
    '("\\<\\(\\w+\\)\\s-*(" (1 font-lock-function-name-face))  ;; functions