VM: Precompiled rodata snapshot.

runtime/vm/dart.h

Index: runtime/vm/dart.h
diff --git a/runtime/vm/dart.h b/runtime/vm/dart.h
index 412eef2c8625d653c429efc589d7b476b115bf08..5fdfcada4a44974f7fa13398980429e71fe5123f 100644
--- a/runtime/vm/dart.h
+++ b/runtime/vm/dart.h
@@ -23,6 +23,7 @@ class Dart : public AllStatic {
   static const char* InitOnce(
       const uint8_t* vm_isolate_snapshot,
       const uint8_t* instructions_snapshot,
+      const uint8_t* data_snapshot,
       Dart_IsolateCreateCallback create,
       Dart_IsolateShutdownCallback shutdown,
       Dart_FileOpenCallback file_open,
@@ -64,6 +65,13 @@ class Dart : public AllStatic {
     return instructions_snapshot_buffer_ != NULL;
   }
 
+  static const uint8_t* data_snapshot_buffer() {
+    return data_snapshot_buffer_;
+  }
+  static void set_data_snapshot_buffer(const uint8_t* buffer) {
+    data_snapshot_buffer_ = buffer;
+  }
+
  private:
   static void WaitForIsolateShutdown();
 
@@ -72,6 +80,7 @@ class Dart : public AllStatic {
   static DebugInfo* pprof_symbol_generator_;
   static ReadOnlyHandles* predefined_handles_;
   static const uint8_t* instructions_snapshot_buffer_;
+  static const uint8_t* data_snapshot_buffer_;
 };
 
 }  // namespace dart