Unifying ChildProcessLauncher across platforms.

content/browser/child_process_launcher_helper_posix.cc

+// Copyright 2017 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 "content/browser/child_process_launcher_helper_posix.h"
+
+#include "base/command_line.h"
+#include "base/metrics/field_trial.h"
+#include "content/browser/file_descriptor_info_impl.h"
+#include "content/public/browser/content_browser_client.h"
+#include "content/public/common/content_client.h"
+#include "content/public/common/content_descriptors.h"
+#include "mojo/edk/embedder/platform_handle.h"
+
+namespace content {
+namespace internal {
+
+std::unique_ptr<FileDescriptorInfo> CreateDefaultPosixFilesToMap(
+    const base::CommandLine& command_line,
+    int child_process_id,
+    const mojo::edk::PlatformHandle& mojo_client_handle) {
+  std::unique_ptr<FileDescriptorInfo> files_to_register(
+      FileDescriptorInfoImpl::Create());
+
+  int field_trial_handle = base::FieldTrialList::GetFieldTrialHandle();
+  if (field_trial_handle != base::kInvalidPlatformFile)
+    files_to_register->Share(kFieldTrialDescriptor, field_trial_handle);
+
+  DCHECK(mojo_client_handle.is_valid());
+  files_to_register->Share(kMojoIPCChannel, mojo_client_handle.handle);
+
+  // TODO(jcivelli): remove this "if defined" by making
+  // GetAdditionalMappedFilesForChildProcess a no op on Mac.
+#if !defined(OS_MACOSX)
+  GetContentClient()->browser()->GetAdditionalMappedFilesForChildProcess(
+      command_line, child_process_id, files_to_register.get());
+#endif
+
+  return files_to_register;
+}
+
+}  // namespace internal
+}  // namespace content