Enable building headless_shell in MAC. This is an initial implementation with a hidden window, rath…

headless/lib/browser/headless_content_browser_client.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 "headless/lib/browser/headless_content_browser_client.h"
 
 #include <memory>
 #include <unordered_set>
 
 #include "base/base_switches.h"
@@ skipping 152 matching lines @@
     content::BrowserContext* context,
     content::StoragePartition* partition,
     const storage::OptionalQuotaSettingsCallback& callback) {
   content::BrowserThread::PostTaskAndReplyWithResult(
       content::BrowserThread::FILE, FROM_HERE,
       base::Bind(&storage::CalculateNominalDynamicSettings,
                  partition->GetPath(), context->IsOffTheRecord()),
       callback);
 }
 
+#if defined(OS_POSIX) && !defined(OS_MACOSX)
 void HeadlessContentBrowserClient::GetAdditionalMappedFilesForChildProcess(
     const base::CommandLine& command_line,
     int child_process_id,
     content::FileDescriptorInfo* mappings) {
 #if defined(HEADLESS_USE_BREAKPAD)
   int crash_signal_fd = GetCrashSignalFD(command_line, *browser_->options());
   if (crash_signal_fd >= 0)
     mappings->Share(kCrashDumpSignal, crash_signal_fd);
 #endif  // defined(HEADLESS_USE_BREAKPAD)
 }
+#endif  // defined(OS_POSIX) && !defined(OS_MACOSX)
 
 void HeadlessContentBrowserClient::AppendExtraCommandLineSwitches(
     base::CommandLine* command_line,
     int child_process_id) {
 #if defined(HEADLESS_USE_BREAKPAD)
   // This flag tells child processes to also turn on crash reporting.
   if (breakpad::IsCrashReporterEnabled())
     command_line->AppendSwitch(switches::kEnableCrashReporter);
 #endif  // defined(HEADLESS_USE_BREAKPAD)
 }
 
 }  // namespace headless