Add dvlog_always_on to enable DVLOG without DEBUG and DCHECK option

base/logging_unittest.cc

Index: base/logging_unittest.cc
diff --git a/base/logging_unittest.cc b/base/logging_unittest.cc
index 0a1fed40830af069c9a383ce9606b15e04220744..13c2e2a1a9cf422903aea9b9aa2d414f71ffba48 100644
--- a/base/logging_unittest.cc
+++ b/base/logging_unittest.cc
@@ -83,7 +83,7 @@ class MockLogAssertHandler {
 TEST_F(LoggingTest, BasicLogging) {
   MockLogSource mock_log_source;
   EXPECT_CALL(mock_log_source, Log())
-      .Times(DCHECK_IS_ON() ? 16 : 8)
+      .Times(DCHECK_IS_ON() || DVLOG_IS_ON() ? 16 : 8)
       .WillRepeatedly(Return("log message"));
 
   SetMinLogLevel(LOG_INFO);
@@ -371,7 +371,7 @@ TEST_F(LoggingTest, CheckCausesDistinctBreakpoints) {
 #endif  // OS_POSIX
 
 TEST_F(LoggingTest, DebugLoggingReleaseBehavior) {
-#if DCHECK_IS_ON()
+#if DCHECK_IS_ON() || DVLOG_IS_ON()
   int debug_only_variable = 1;
 #endif
   // These should avoid emitting references to |debug_only_variable|
@@ -385,7 +385,7 @@ TEST_F(LoggingTest, DebugLoggingReleaseBehavior) {
 TEST_F(LoggingTest, DcheckStreamsAreLazy) {
   MockLogSource mock_log_source;
   EXPECT_CALL(mock_log_source, Log()).Times(0);
-#if DCHECK_IS_ON()
+#if DCHECK_IS_ON() || DVLOG_IS_ON()
   DCHECK(true) << mock_log_source.Log();
   DCHECK_EQ(0, 0) << mock_log_source.Log();
 #else
@@ -479,6 +479,19 @@ TEST_F(LoggingTest, MAYBE_Dcheck) {
   EXPECT_EQ(DCHECK_IS_ON() ? 2 : 0, g_log_sink_call_count);
 }
 
+TEST_F(LoggingTest, Dvlog) {
+#if defined(NDEBUG) && !defined(DVLOG_ALWAYS_ON)
+  // Release build.
+  EXPECT_FALSE(DVLOG_IS_ON());
+#elif defined(NDEBUG) && defined(DVLOG_ALWAYS_ON)
+  // Release build with real DVLOGs
+  EXPECT_TRUE(DVLOG_IS_ON());
+#else
+  // Debug build.
+  EXPECT_TRUE(DVLOG_IS_ON());
+#endif
+}
+
 TEST_F(LoggingTest, DcheckReleaseBehavior) {
   int some_variable = 1;
   // These should still reference |some_variable| so we don't get