Default to LS_INFO logging for release builds.

Increases default loglevel for test targets to LS_INFO, which is a no-op
for debug builds but increases logging on release builds.

This is to present better debug info on buildbots when test runs fail.

BUG=
R=henrikg@webrtc.org, kjellander@webrtc.org, stefan@webrtc.org

Review URL: https://codereview.webrtc.org/1479183002 .

Cr-Commit-Position: refs/heads/master@{#10826}
diff --git a/webrtc/test/test_main.cc b/webrtc/test/test_main.cc
index 733831f..a435575 100644
--- a/webrtc/test/test_main.cc
+++ b/webrtc/test/test_main.cc
@@ -10,6 +10,7 @@
 
 #include "gflags/gflags.h"
 #include "testing/gtest/include/gtest/gtest.h"
+#include "webrtc/base/logging.h"
 #include "webrtc/test/field_trial.h"
 #include "webrtc/test/testsupport/fileutils.h"
 
@@ -21,6 +22,11 @@
 int main(int argc, char* argv[]) {
   ::testing::InitGoogleTest(&argc, argv);
 
+  // Default to LS_INFO, even for release builds to provide better test logging.
+  // TODO(pbos): Consider adding a command-line override.
+  if (rtc::LogMessage::GetLogToDebug() > rtc::LS_INFO)
+    rtc::LogMessage::LogToDebug(rtc::LS_INFO);
+
   // AllowCommandLineParsing allows us to ignore flags passed on to us by
   // Chromium build bots without having to explicitly disable them.
   google::AllowCommandLineReparsing();