Fix compiler driver gtest.

(cherry picked from commit 35c4e0b2ad573e820d6e9d461a571af300611d36)

Change-Id: Ia59f4463a6158f7a949debd7a93f35fa633cd36a
diff --git a/runtime/jit/offline_profiling_info.h b/runtime/jit/offline_profiling_info.h
index ffd1433..c388c4a 100644
--- a/runtime/jit/offline_profiling_info.h
+++ b/runtime/jit/offline_profiling_info.h
@@ -66,6 +66,8 @@
 
   // For testing purposes.
   bool Equals(ProfileCompilationInfo& other);
+  // Exposed for testing purpose.
+  static std::string GetProfileDexFileKey(const std::string& dex_location);
 
  private:
   bool AddData(const std::string& dex_location, uint32_t checksum, uint16_t method_idx);