Report CHECK/DCHECK to test launcher summary output.

base/logging_unittest.cc

Index: base/logging_unittest.cc
diff --git a/base/logging_unittest.cc b/base/logging_unittest.cc
index f41cce2f43b390fa9603a14f3f689fe87d0dcb33..e5c65d7d20ce7622d5f7008eb6d6296becf5e148 100644
--- a/base/logging_unittest.cc
+++ b/base/logging_unittest.cc
@@ -52,6 +52,20 @@ class MockLogSource {
   MOCK_METHOD0(Log, const char*());
 };
 
+// Message handler used by test launcher to debug CHECK/DCHECK.
+// This object will temporary disable message handler for test.

[dcheng, 2017/01/20 08:26:23]

Nit: Scoper object to temporarily clear any log message handlers for testing
DCHECK/CHECK functionality.

[alex-ac, 2017/01/20 12:11:16]

Done.

+class MockLogMessageHandler {
+ public:
+  MockLogMessageHandler() : saved_handler_(GetLogMessageHandler()) {
+    SetLogMessageHandler(nullptr);
+  }
+
+  ~MockLogMessageHandler() { SetLogMessageHandler(saved_handler_); }
+
+ private:
+  LogMessageHandlerFunction saved_handler_;
+};
+
 TEST_F(LoggingTest, BasicLogging) {
   MockLogSource mock_log_source;
   EXPECT_CALL(mock_log_source, Log()).Times(DEBUG_MODE ? 16 : 8).
@@ -152,6 +166,7 @@ TEST_F(LoggingTest, LoggingIsLazyBySeverity) {
 }
 
 TEST_F(LoggingTest, LoggingIsLazyByDestination) {
+  MockLogMessageHandler mock_handler;
   MockLogSource mock_log_source;
   MockLogSource mock_log_source_error;
   EXPECT_CALL(mock_log_source, Log()).Times(0);