[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 95685250cd23a9dd42e61ebc43e41cfb622f244d..401da3ff6641408e488ed4e4631611452cdb6f80 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>
@@ -16,16 +17,19 @@
 namespace base {
 namespace trace_event {
 
-StackFrameDeduplicator::FrameNode::FrameNode(StackFrame frame,
+StackFrameDeduplicator::FrameNode::FrameNode(StackFrameType frame_type,
+                                             StackFrame frame,
                                              int parent_frame_index)
-    : frame(frame), parent_frame_index(parent_frame_index) {}
+    : frame_type(frame_type), frame(frame),
+      parent_frame_index(parent_frame_index) {}
 StackFrameDeduplicator::FrameNode::FrameNode(const FrameNode& other) = default;
 StackFrameDeduplicator::FrameNode::~FrameNode() {}
 
 StackFrameDeduplicator::StackFrameDeduplicator() {}
 StackFrameDeduplicator::~StackFrameDeduplicator() {}
 
-int StackFrameDeduplicator::Insert(const StackFrame* beginFrame,
+int StackFrameDeduplicator::Insert(StackFrameType frame_type,
+                                   const StackFrame* beginFrame,
                                    const StackFrame* endFrame) {
   int frame_index = -1;
   std::map<StackFrame, int>* nodes = &roots_;
@@ -38,7 +42,7 @@ int StackFrameDeduplicator::Insert(const StackFrame* beginFrame,
     if (node == nodes->end()) {
       // There is no tree node for this frame yet, create it. The parent node
       // is the node associated with the previous frame.
-      FrameNode frame_node(frame, frame_index);
+      FrameNode frame_node(frame_type, frame, frame_index);
 
       // The new frame node will be appended, so its index is the current size
       // of the vector.
@@ -78,7 +82,18 @@ void StackFrameDeduplicator::AppendAsTraceFormat(std::string* out) const {
     out->append(stringify_buffer);
 
     scoped_ptr<TracedValue> frame_node_value(new TracedValue);
-    frame_node_value->SetString("name", frame_node->frame);
+    switch (frame_node->frame_type) {
+      case STACK_FRAME_TYPE_SYMBOL:
+        frame_node_value->SetString(
+            "name", static_cast<const char*>(frame_node->frame));
+        break;
+      case STACK_FRAME_TYPE_PC:
+        SStringPrintf(&stringify_buffer,
+                      "pc:%" PRIxPTR,
+                      reinterpret_cast<uintptr_t>(frame_node->frame));
+        frame_node_value->SetString("name", stringify_buffer);
+        break;
+    }
     if (frame_node->parent_frame_index >= 0) {
       SStringPrintf(&stringify_buffer, "%d", frame_node->parent_frame_index);
       frame_node_value->SetString("parent", stringify_buffer);