Add Locking calls to file_io.h plus implementations and test

util/test/thread.cc

 // Copyright 2015 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // 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
 }  // namespace crashpad