Make SharedMemoryHandle a class on windows.

base/memory/shared_memory_handle_win.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/memory/shared_memory_handle.h"
+
+#include "base/logging.h"
+
+namespace base {
+
+SharedMemoryHandle::SharedMemoryHandle()
+    : handle_(nullptr), pid_(kNullProcessId) {}
+
+SharedMemoryHandle::SharedMemoryHandle(HANDLE h, base::ProcessId pid)
+    : handle_(h), pid_(pid) {}
+
+SharedMemoryHandle::SharedMemoryHandle(const SharedMemoryHandle& handle)
+    : handle_(handle.handle_), pid_(handle.pid_) {}
+
+SharedMemoryHandle& SharedMemoryHandle::operator=(
+    const SharedMemoryHandle& handle) {
+  if (this == &handle)
+    return *this;
+
+  handle_ = handle.handle_;
+  pid_ = handle.pid_;
+  return *this;
+}
+
+bool SharedMemoryHandle::operator==(const SharedMemoryHandle& handle) const {
+  // Invalid handles are always equal.
+  if (!IsValid() && !handle.IsValid())
+    return true;
+
+  return handle_ == handle.handle_ && pid_ == handle.pid_;
+}
+
+bool SharedMemoryHandle::operator!=(const SharedMemoryHandle& handle) const {
+  return !(*this == handle);
+}
+
+void SharedMemoryHandle::Close() const {
+  DCHECK(handle_ != nullptr);
+  DCHECK(BelongsToCurrentProcess());
+  ::CloseHandle(handle_);
+}
+
+bool SharedMemoryHandle::IsValid() const {
+  return handle_ != nullptr;
+}
+
+bool SharedMemoryHandle::BelongsToCurrentProcess() const {
+  return pid_ == base::GetCurrentProcId();
+}
+
+bool SharedMemoryHandle::NeedsBrokering() const {
+  return false;
+}
+
+HANDLE SharedMemoryHandle::GetHandle() const {
+  return handle_;
+}
+
+base::ProcessId SharedMemoryHandle::GetPID() const {
+  return pid_;
+}
+
+}  // namespace base