Resubmission of native memory allocation info surfacing in Observatory. Fixed crashing tests and st…

runtime/vm/profiler.h

Index: runtime/vm/profiler.h
diff --git a/runtime/vm/profiler.h b/runtime/vm/profiler.h
index 49e59df6c83e4c3e194119268ca3387d64920920..1a44ed9f196ad37bf75c95c6b530fbd74eb07495 100644
--- a/runtime/vm/profiler.h
+++ b/runtime/vm/profiler.h
@@ -11,6 +11,7 @@
 #include "vm/globals.h"
 #include "vm/growable_array.h"
 #include "vm/malloc_hooks.h"
+#include "vm/native_symbol.h"
 #include "vm/object.h"
 #include "vm/tags.h"
 #include "vm/thread_interrupter.h"
@@ -220,6 +221,21 @@ class Sample {
     pcs[i] = pc;
   }
 
+  void DumpStackTrace() {
+    for (intptr_t i = 0; i < pcs_length_; ++i) {
+      uintptr_t start = 0;
+      uword pc = At(i);
+      char* native_symbol_name =
+          NativeSymbolResolver::LookupSymbolName(pc, &start);
+      if (native_symbol_name == NULL) {
+        OS::PrintErr("  [0x%" Pp "] Unknown symbol\n", pc);
+      } else {
+        OS::PrintErr("  [0x%" Pp "] %s\n", pc, native_symbol_name);
+        NativeSymbolResolver::FreeSymbolName(native_symbol_name);
+      }
+    }
+  }
+
   uword vm_tag() const { return vm_tag_; }
   void set_vm_tag(uword tag) {
     ASSERT(tag != VMTag::kInvalidTagId);