Dart: Lazy observatory asset loading. Option to disable the observatory.

mojo/dart/embedder/dart_controller.h

Index: mojo/dart/embedder/dart_controller.h
diff --git a/mojo/dart/embedder/dart_controller.h b/mojo/dart/embedder/dart_controller.h
index 510d14d46c4feaba1d801b9c72c8f8a56f536f5a..8316f084b0baa7084640bccb61997c34dbf6b2c7 100644
--- a/mojo/dart/embedder/dart_controller.h
+++ b/mojo/dart/embedder/dart_controller.h
@@ -107,6 +107,7 @@ class DartController {
   // type checking enabled.
   static bool Initialize(DartControllerServiceConnector* service_connector,
                          bool strict_compilation,
+                         bool observatory_enabled,
                          const char** extra_args,
                          int extra_args_count);
 
@@ -166,6 +167,7 @@ class DartController {
   static MojoHandle handle_watcher_producer_handle_;
   static bool initialized_;
   static bool strict_compilation_;
+  static bool observatory_enabled_;
   static bool service_isolate_running_;
   static bool service_isolate_spawned_;
   static DartControllerServiceConnector* service_connector_;