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

runtime/vm/malloc_hooks_test.cc

Index: runtime/vm/malloc_hooks_test.cc
diff --git a/runtime/vm/malloc_hooks_test.cc b/runtime/vm/malloc_hooks_test.cc
index 834a340b8765e7a16dd12d1867aa1892602e8216..379ff5b1755ca3768d92ae4f7151943ab5f02de1 100644
--- a/runtime/vm/malloc_hooks_test.cc
+++ b/runtime/vm/malloc_hooks_test.cc
@@ -156,10 +156,14 @@ VM_UNIT_TEST_CASE(StackTraceMallocHookLengthTest) {
   if (!(first_result && second_result)) {
     OS::PrintErr(
         "If this test is failing, it's likely that the value set for"
-        "the number of frames to skip in malloc_hooks.cc is "
+        " the number of frames to skip in malloc_hooks.cc is "
         "incorrect for this configuration/platform. This value can be"
         " found in malloc_hooks.cc in the AllocationInfo class, and "
-        "is stored in the kSkipCount constant.");
+        "is stored in the kSkipCount constant.\n");
+    OS::PrintErr("First result: %d Second Result: %d\n", first_result,
+                 second_result);
+    OS::PrintErr("Dumping sample stack trace:\n");
+    sample->DumpStackTrace();
   }
 
   free(var);