[tracing] Add native allocation tracing mode.

base/trace_event/memory_dump_manager.cc

Index: base/trace_event/memory_dump_manager.cc
diff --git a/base/trace_event/memory_dump_manager.cc b/base/trace_event/memory_dump_manager.cc
index 35b27d9a03a0a0212b0f807e83068881f3d4395b..9bfb3bc333c14244bad205036da7dbe1e04158c1 100644
--- a/base/trace_event/memory_dump_manager.cc
+++ b/base/trace_event/memory_dump_manager.cc
@@ -169,7 +169,13 @@ void MemoryDumpManager::EnableHeapProfilingIfNeeded() {
           switches::kEnableHeapProfiling))
     return;
 
-  AllocationContextTracker::SetCaptureEnabled(true);
+  std::string profiling_mode = CommandLine::ForCurrentProcess()
+      ->GetSwitchValueASCII(switches::kEnableHeapProfiling);
+  AllocationContextTracker::SetCaptureMode(
+      profiling_mode == switches::kEnableHeapProfilingModeNative ?
+          AllocationContextTracker::CAPTURE_NATIVE_STACK :
+          AllocationContextTracker::CAPTURE_PSEUDO_STACK);
+
   for (auto mdp : dump_providers_)
     mdp->dump_provider->OnHeapProfilingEnabled(true);
   heap_profiling_enabled_ = true;