NativeStackSampler implementation for Mac.

chrome/common/stack_sampling_configuration.cc

Index: chrome/common/stack_sampling_configuration.cc
diff --git a/chrome/common/stack_sampling_configuration.cc b/chrome/common/stack_sampling_configuration.cc
index c2b0786442b1541f0c0f2ec144f5b300a16f3585..fc4e823338975982d97b4a0015e61d66a0e16953 100644
--- a/chrome/common/stack_sampling_configuration.cc
+++ b/chrome/common/stack_sampling_configuration.cc
@@ -5,6 +5,7 @@
 #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"
@@ -17,10 +18,10 @@ 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();