Add a VerifierDeps::Dump method.

Also, fix the Encode/Decode logic around dex file order:
iterating over a std::map doesn't guarantee insertion order.

test: verifier_deps_test
bug: 30937355

Change-Id: Id3efd703b3c8ca21ab49c2600c612c132fb021cd
diff --git a/runtime/common_runtime_test.h b/runtime/common_runtime_test.h
index 92934c6..827e85e 100644
--- a/runtime/common_runtime_test.h
+++ b/runtime/common_runtime_test.h
@@ -133,6 +133,8 @@
       REQUIRES_SHARED(Locks::mutator_lock_);
 
   jobject LoadDex(const char* dex_name) REQUIRES_SHARED(Locks::mutator_lock_);
+  jobject LoadMultiDex(const char* first_dex_name, const char* second_dex_name)
+      REQUIRES_SHARED(Locks::mutator_lock_);
 
   std::string android_data_;
   std::string dalvik_cache_;