Add HeapTest and make GC work enough to pass it

Change-Id: If06eaef2921b64b3226bfd347acaec60ec993e67
diff --git a/src/common_test.h b/src/common_test.h
index bb9b93c..c79cea6 100644
--- a/src/common_test.h
+++ b/src/common_test.h
@@ -8,9 +8,11 @@
 #include "UniquePtr.h"
 #include "base64.h"
 #include "class_linker.h"
+#include "class_loader.h"
 #include "dex_file.h"
-#include "heap.h"
 #include "gtest/gtest.h"
+#include "heap.h"
+#include "runtime.h"
 #include "stringprintf.h"
 #include "thread.h"
 #include "unicode/uclean.h"