NativeStackSampler implementation for Mac.

base/profiler/native_stack_sampler_win.cc

Index: base/profiler/native_stack_sampler_win.cc
diff --git a/base/profiler/native_stack_sampler_win.cc b/base/profiler/native_stack_sampler_win.cc
index e1605109fe960d769523733b2a1190700b250d28..d320fea98a1cc778fe69d6d519d056a00d308820 100644
--- a/base/profiler/native_stack_sampler_win.cc
+++ b/base/profiler/native_stack_sampler_win.cc
@@ -398,14 +398,12 @@ class NativeStackSamplerWin : public NativeStackSampler {
   void ProfileRecordingStopped() override;
 
  private:
-  enum {
-    // Intended to hold the largest stack used by Chrome. The default Win32
-    // reserved stack size is 1 MB and Chrome Windows threads currently always
-    // use the default, but this allows for expansion if it occurs. The size
-    // beyond the actual stack size consists of unallocated virtual memory pages
-    // so carries little cost (just a bit of wasted address space).
-    kStackCopyBufferSize = 2 * 1024 * 1024
-  };
+  // Intended to hold the largest stack used by Chrome. The default Win32
+  // reserved stack size is 1 MB and Chrome Windows threads currently always
+  // use the default, but this allows for expansion if it occurs. The size
+  // beyond the actual stack size consists of unallocated virtual memory pages
+  // so carries little cost (just a bit of wasted address space).
+  static constexpr size_t kStackCopyBufferSize = 2 * 1024 * 1024;
 
   // Attempts to query the module filename, base address, and id for
   // |module_handle|, and store them in |module|. Returns true if it succeeded.
@@ -474,9 +472,6 @@ void NativeStackSamplerWin::RecordStackSample(
     StackSamplingProfiler::Sample* sample) {
   DCHECK(current_modules_);
 
-  if (!stack_copy_buffer_)
-    return;
-
   std::vector<RecordedFrame> stack;
   SuspendThreadAndRecordStack(thread_handle_.Get(), thread_stack_base_address_,
                               stack_copy_buffer_.get(), kStackCopyBufferSize,