Copy Crashpad into the Chrome tree instead of importing it via DEPS

third_party/crashpad/crashpad/util/synchronization/semaphore_posix.cc

+// Copyright 2014 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/synchronization/semaphore.h"
+
+#include <errno.h>
+
+#include <cmath>
+
+#include "base/logging.h"
+#include "base/posix/eintr_wrapper.h"
+
+namespace crashpad {
+
+#if !defined(OS_MACOSX)
+
+Semaphore::Semaphore(int value) {
+  PCHECK(sem_init(&semaphore_, 0, value) == 0) << "sem_init";
+}
+
+Semaphore::~Semaphore() {
+  PCHECK(sem_destroy(&semaphore_) == 0) << "sem_destroy";
+}
+
+void Semaphore::Wait() {
+  PCHECK(HANDLE_EINTR(sem_wait(&semaphore_)) == 0) << "sem_wait";
+}
+
+bool Semaphore::TimedWait(double seconds) {
+  DCHECK_GE(seconds, 0.0);
+  timespec timeout;
+  timeout.tv_sec = seconds;
+  timeout.tv_nsec = (seconds - trunc(seconds)) * 1E9;
+
+  int rv = HANDLE_EINTR(sem_timedwait(&semaphore_, &timeout));
+  PCHECK(rv == 0 || errno == ETIMEDOUT) << "sem_timedwait";
+  return rv == 0;
+}
+
+void Semaphore::Signal() {
+  PCHECK(sem_post(&semaphore_) == 0) << "sem_post";
+}
+
+#endif
+
+}  // namespace crashpad