[tracing] Ignore tracing allocations in heap profiler

base/trace_event/trace_buffer.cc

Index: base/trace_event/trace_buffer.cc
diff --git a/base/trace_event/trace_buffer.cc b/base/trace_event/trace_buffer.cc
index b9f80b27b6924daa5f62874a4104d3f49ed0c915..3faa934b2467de8c499abb4a1682a04ec385d4c8 100644
--- a/base/trace_event/trace_buffer.cc
+++ b/base/trace_event/trace_buffer.cc
@@ -9,6 +9,7 @@
 #include <vector>
 
 #include "base/macros.h"
+#include "base/trace_event/malloc_dump_provider.h"
 #include "base/trace_event/trace_event_impl.h"
 
 namespace base {
@@ -31,6 +32,7 @@ class TraceBufferRingBuffer : public TraceBuffer {
   }
 
   std::unique_ptr<TraceBufferChunk> GetChunk(size_t* index) override {
+    SCOPED_HEAP_PROFILER_IGNORE_MALLOC_EVENT;

[Primiano Tucci (use gerrit), 2016/04/20 16:34:57]

I think you want to move this only to line 52 which does the new? Nothing else
here should do a malloc

[ssid, 2016/04/21 01:07:46]

There is a chunks_.resize call too. When we can capture this, why not.

[Primiano Tucci (use gerrit), 2016/04/21 19:47:31]

ahh right

     // Because the number of threads is much less than the number of chunks,
     // the queue should never be empty.
     DCHECK(!QueueIsEmpty());