Add Locking calls to file_io.h plus implementations and test

util/test/thread.cc

Index: util/test/thread.cc
diff --git a/util/test/scoped_temp_dir.cc b/util/test/thread.cc
similarity index 79%
copy from util/test/scoped_temp_dir.cc
copy to util/test/thread.cc
index a2f8d251430fde0adc2227365c539f34ab6d335d..55d449858bed33977e06d740ab0b5b5095d414d4 100644
--- a/util/test/scoped_temp_dir.cc
+++ b/util/test/thread.cc
@@ -12,16 +12,18 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include "util/test/scoped_temp_dir.h"
+#include "util/test/thread.h"
+
+#include "gtest/gtest.h"
 
 namespace crashpad {
 namespace test {
 
-ScopedTempDir::ScopedTempDir() : path_(CreateTemporaryDirectory()) {
+Thread::Thread() : platform_thread_(0) {
 }
 
-ScopedTempDir::~ScopedTempDir() {
-  RecursivelyDeleteTemporaryDirectory(path());
+Thread::~Thread() {
+  EXPECT_FALSE(platform_thread_);
 }
 
 }  // namespace test