profiling: Add ClientConfiguration for sampling rate.

Change-Id: I88209ca37d441c0d256bbef989527535cf299f2b
diff --git a/src/profiling/memory/client.h b/src/profiling/memory/client.h
index 46a571d..93a262f 100644
--- a/src/profiling/memory/client.h
+++ b/src/profiling/memory/client.h
@@ -103,9 +103,12 @@
   void RecordMalloc(uint64_t alloc_size, uint64_t alloc_address);
   void RecordFree(uint64_t alloc_address);
 
+  ClientConfiguration client_config_for_testing() { return client_config_; }
+
  private:
   const char* GetStackBase();
 
+  ClientConfiguration client_config_;
   SocketPool socket_pool_;
   FreePage free_page_;
   const char* main_thread_stack_base_ = nullptr;