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

third_party/crashpad/crashpad/util/synchronization/semaphore_mac.cc

Index: third_party/crashpad/crashpad/util/synchronization/semaphore_mac.cc
diff --git a/third_party/crashpad/crashpad/util/synchronization/semaphore_mac.cc b/third_party/crashpad/crashpad/util/synchronization/semaphore_mac.cc
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+// 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 "base/logging.h"
+
+namespace crashpad {
+
+Semaphore::Semaphore(int value)
+    : semaphore_(dispatch_semaphore_create(value)) {
+  CHECK(semaphore_) << "dispatch_semaphore_create";
+}
+
+Semaphore::~Semaphore() {
+  dispatch_release(semaphore_);
+}
+
+void Semaphore::Wait() {
+  CHECK_EQ(dispatch_semaphore_wait(semaphore_, DISPATCH_TIME_FOREVER), 0);
+}
+
+bool Semaphore::TimedWait(double seconds) {
+  DCHECK_GE(seconds, 0.0);
+  const dispatch_time_t timeout =
+      dispatch_time(DISPATCH_TIME_NOW, seconds * NSEC_PER_SEC);
+  return dispatch_semaphore_wait(semaphore_, timeout) == 0;
+}
+
+void Semaphore::Signal() {
+  dispatch_semaphore_signal(semaphore_);
+}
+
+}  // namespace crashpad