NativeStackSampler implementation for Mac.

chrome/common/stack_sampling_configuration.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 "chrome/common/stack_sampling_configuration.h"
 
 #include "base/command_line.h"
+#include "base/compiler_specific.h"
 #include "base/lazy_instance.h"
 #include "base/rand_util.h"
 #include "chrome/common/channel_info.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/version_info/version_info.h"
 #include "content/public/common/content_switches.h"
 
 namespace {
 
 base::LazyInstance<StackSamplingConfiguration>::Leaky g_configuration =
     LAZY_INSTANCE_INITIALIZER;
 
-// The profiler is currently only implemented for Windows x64, and only runs on
-// trunk, canary, and dev.
+// The profiler is currently only implemented for Windows x64 and Mac x64, and
+// only runs on trunk, canary, and dev.
 bool IsProfilerSupported() {
-#if !defined(_WIN64)
+#if !defined(_WIN64) && !defined(OS_MACOSX)
   return false;
 #else
   const version_info::Channel channel = chrome::GetChannel();
   return (channel == version_info::Channel::UNKNOWN ||
           channel == version_info::Channel::CANARY ||
           channel == version_info::Channel::DEV);
 #endif
 }
 
 // Returns true if the current execution is taking place in the browser process.
@@ skipping 158 matching lines @@
         { PROFILE_GPU_PROCESS, 0},
         { PROFILE_BROWSER_AND_GPU_PROCESS, 80},
         { PROFILE_CONTROL, 10},
         { PROFILE_DISABLED, 10}
       });
 
     default:
       return PROFILE_DISABLED;
   }
 }