Display the tmp path to help debug an issue with a build bot.

base/sys_info_unittest.cc

 // Copyright (c) 2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/file_util.h"
 #include "base/platform_test.h"
 #include "base/sys_info.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 typedef PlatformTest SysInfoTest;
 
 TEST_F(SysInfoTest, NumProcs) {
   // We aren't actually testing that it's correct, just that it's sane.
   EXPECT_GE(base::SysInfo::NumberOfProcessors(), 1);
 }
 
 TEST_F(SysInfoTest, AmountOfMem) {
   // We aren't actually testing that it's correct, just that it's sane.
   EXPECT_GT(base::SysInfo::AmountOfPhysicalMemory(), 0);
   EXPECT_GT(base::SysInfo::AmountOfPhysicalMemoryMB(), 0);
 }
 
 TEST_F(SysInfoTest, AmountOfFreeDiskSpace) {
   // We aren't actually testing that it's correct, just that it's sane.
   std::wstring tmp_path;
   ASSERT_TRUE(file_util::GetTempDir(&tmp_path));
-  EXPECT_GT(base::SysInfo::AmountOfFreeDiskSpace(tmp_path), 0);
+  EXPECT_GT(base::SysInfo::AmountOfFreeDiskSpace(tmp_path), 0) << tmp_path;
 }