Move thread from test/ to util/thread/.

test/thread_posix.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 "test/thread.h"
-
-#include "gtest/gtest.h"
-#include "test/errors.h"
-
-namespace crashpad {
-namespace test {
-
-void Thread::Start() {
-  ASSERT_FALSE(platform_thread_);
-  int rv = pthread_create(&platform_thread_, nullptr, ThreadEntryThunk, this);
-  ASSERT_EQ(0, rv) << ErrnoMessage(rv, "pthread_create");
-}
-
-void Thread::Join() {
-  ASSERT_TRUE(platform_thread_);
-  int rv = pthread_join(platform_thread_, nullptr);
-  EXPECT_EQ(0, rv) << ErrnoMessage(rv, "pthread_join");
-  platform_thread_ = 0;
-}
-
-// static
-void* Thread::ThreadEntryThunk(void* argument) {
-  Thread* self = reinterpret_cast<Thread*>(argument);
-  self->ThreadMain();
-  return nullptr;
-}
-
-}  // namespace test
-}  // namespace crashpad