Make scoped enums output streamable.

base/logging_unittest.cc

Index: base/logging_unittest.cc
diff --git a/base/logging_unittest.cc b/base/logging_unittest.cc
index e0619425f7542804b0c4604aba51603f619ef3b8..8f941a92736c41a25b42484d05fadcffd8dced6e 100644
--- a/base/logging_unittest.cc
+++ b/base/logging_unittest.cc
@@ -258,6 +258,14 @@ TEST_F(LoggingTest, CheckEqStatements) {
     CHECK_EQ(false, true);           // Unreached.
 }
 
+// Test that scoped enums can be used with CHECK_EQ.
+TEST_F(LoggingTest, ScopedEnum) {
+  enum class TestEnum {

[danakj, 2015/11/20 19:42:28]

can you check fixed signed and unsigned int also? what happens with fixed
size_t?

+    Value,
+  };
+  CHECK_EQ(TestEnum::Value, TestEnum::Value);
+}
+
 // Test that defining an operator<< for a type in a namespace doesn't prevent
 // other code in that namespace from calling the operator<<(ostream, wstring)
 // defined by logging.h. This can fail if operator<<(ostream, wstring) can't be