Enhance CHECK_EQ and friends to allow extra detail to be appended (like CHECK).

Change-Id: Iaa980892ab31621c8bcca9ea7c6c4ee743333f45
diff --git a/src/logging.cc b/src/logging.cc
index 5e9ae3a..35a84ed 100644
--- a/src/logging.cc
+++ b/src/logging.cc
@@ -20,15 +20,13 @@
 #include "thread.h"
 #include "utils.h"
 
-namespace {
+namespace art {
 
 art::Mutex& GetLoggingLock() {
   static art::Mutex lock("LogMessage lock");
   return lock;
 }
 
-}
-
 LogMessage::~LogMessage() {
   // Finish constructing the message.
   if (errno_ != -1) {
@@ -62,3 +60,5 @@
 std::ostream& LogMessage::stream() {
   return buffer_;
 }
+
+}  // namespace art