Use cctest to track memory stats for isolate and context.

test/cctest/test-serialize.cc

Index: test/cctest/test-serialize.cc
diff --git a/test/cctest/test-serialize.cc b/test/cctest/test-serialize.cc
index cb7094cf92067aaa893e0180916f4ebd6805b6fd..68e371b96edc43aa2bb6c9f82bbc80967097f9e6 100644
--- a/test/cctest/test-serialize.cc
+++ b/test/cctest/test-serialize.cc
@@ -1549,3 +1549,11 @@ TEST(SerializeInternalReference) {
   }
   isolate->Dispose();
 }
+
+
+TEST(SerializationMemoryStats) {
+  FLAG_profile_deserialization = true;
+  FLAG_always_opt = false;
+  v8::StartupData blob = v8::V8::CreateSnapshotDataBlob();
+  delete[] blob.data;
+}