Don't check for debugDidSendFirstFrameEvent when adding service extensions for Dart VM apps. (#1670)
Don't check for debugDidSendFirstFrameEvent when adding service extensions for Dart VM apps. (#1670)

* Don't check for debugDidSendFirstFrameEvent when adding service extensions for Dart VM apps.

flutter/devtools,flutter/devtools,flutter/devtools,flutter/devtools,flutter/devtools,flutter/devtools,flutter/devtools,flutter/devtools,flutter/devtools