[tracing] Add native allocation tracing mode.

base/trace_event/heap_profiler_stack_frame_deduplicator.cc

Index: base/trace_event/heap_profiler_stack_frame_deduplicator.cc
diff --git a/base/trace_event/heap_profiler_stack_frame_deduplicator.cc b/base/trace_event/heap_profiler_stack_frame_deduplicator.cc
index 22957804f137b38b44f1610e6621c698702bbbd3..49a235051c0731fd930bd7a897fc793cb867ab40 100644
--- a/base/trace_event/heap_profiler_stack_frame_deduplicator.cc
+++ b/base/trace_event/heap_profiler_stack_frame_deduplicator.cc
@@ -4,6 +4,7 @@
 
 #include "base/trace_event/heap_profiler_stack_frame_deduplicator.h"
 
+#include <inttypes.h>
 #include <stddef.h>
 
 #include <string>
@@ -90,6 +91,12 @@ void StackFrameDeduplicator::AppendAsTraceFormat(std::string* out) const {
                       static_cast<const char*>(frame.value));
         frame_node_value->SetString("name", stringify_buffer);
         break;
+      case StackFrame::Type::PROGRAM_COUNTER:
+        SStringPrintf(&stringify_buffer,
+                      "pc:%" PRIxPTR,
+                      reinterpret_cast<uintptr_t>(frame.value));
+        frame_node_value->SetString("name", stringify_buffer);
+        break;
     }
     if (frame_node->parent_frame_index >= 0) {
       SStringPrintf(&stringify_buffer, "%d", frame_node->parent_frame_index);