Write zookeeper client log using google glog

I don't like the fact every other piece of log in my program is happily written by google glog but zookeeper is messing stderr by writing the log there. Besides, I like the format of glog better so I made a quick change to ask zookeeper c clien to write log using glog, here is a quick patch:

diff --git a/third-party/zookeeper/src/c/include/zookeeper_log.h b/third-party/zookeeper/src/c/include/zookeeper_log.h
index e5917cb..6519587 100644
--- a/third-party/zookeeper/src/c/include/zookeeper_log.h
+++ b/third-party/zookeeper/src/c/include/zookeeper_log.h
@@ -28,6 +28,24 @@ extern "C" {
 extern ZOOAPI ZooLogLevel logLevel;
 #define LOGSTREAM getLogStream()

+#define ZOOKEEPER_GLOG
+#ifdef ZOOKEEPER_GLOG
+ZOOAPI void zk_glog_message(int curLevel, int line, const char* funcName,
+                            const char* message);
+/* We can't include glog/log_severity.h because it's in C++ style, so
+ * we hard code the corresponding log level here */
+#define LOG_ERROR(x) if(logLevel>=ZOO_LOG_LEVEL_ERROR) \
+    zk_glog_message(2, __LINE__, __FILE__, format_log_message x)
+#define LOG_WARN(x) if(logLevel>=ZOO_LOG_LEVEL_WARN) \
+    zk_glog_message(1, __LINE__, __FILE__, format_log_message x)
+#define LOG_INFO(x) if(logLevel>=ZOO_LOG_LEVEL_INFO) \
+    zk_glog_message(0, __LINE__, __FILE__, format_log_message x)
+#define LOG_DEBUG(x) if(logLevel==ZOO_LOG_LEVEL_DEBUG) \
+    zk_glog_message(0, __LINE__, __FILE__, format_log_message x)
+#else
+
 #define LOG_ERROR(x) if(logLevel>=ZOO_LOG_LEVEL_ERROR) \
     log_message(ZOO_LOG_LEVEL_ERROR,__LINE__,__func__,format_log_message x)
 #define LOG_WARN(x) if(logLevel>=ZOO_LOG_LEVEL_WARN) \
@@ -36,6 +54,7 @@ extern ZOOAPI ZooLogLevel logLevel;
     log_message(ZOO_LOG_LEVEL_INFO,__LINE__,__func__,format_log_message x)
 #define LOG_DEBUG(x) if(logLevel==ZOO_LOG_LEVEL_DEBUG) \
     log_message(ZOO_LOG_LEVEL_DEBUG,__LINE__,__func__,format_log_message x)
+#endif

 ZOOAPI void log_message(ZooLogLevel curLevel, int line,const char* funcName,
     const char* message);
diff --git a/third-party/zookeeper/src/c/src/zk_glog.cc b/third-party/zookeeper/src/c/src/zk_glog.cc
new file mode 100644
index 0000000..ad2bdb3
--- /dev/null
+++ b/third-party/zookeeper/src/c/src/zk_glog.cc
@@ -0,0 +1,10 @@
+#include "third-party/google/glog/logging.h"
+#include "zookeeper_log.h"
+
+extern "C" {
+void zk_glog_message(int curLevel, int line, const char* filename,
+                     const char* message) {
+  LogMessage(filename, line, curLevel).stream() << message;
+}
+}