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DevToolsAgentMsg_PauseWorkerContextOnStart was send to the worker process from the browser process in order to pause the worker context when it starts.
Before http://crbug.com/329786 this message was sent between WorkerProcessMsg_CreateWorker and WorkerMsg_StartWorkerContext.
So the worker was successfully paused before started.
But after http://crbug.com/329786 the worker context may be started before the worker process receives this message because WorkerMsg_StartWorkerContext is no longer sent from the browser process.
So we have to add pause_on_start flag to WorkerProcessMsg_CreateWorker_Params to pause the worker context correctly.

BUG=329786

Review URL: https://codereview.chromium.org/213423008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@260377 0039d316-1c4b-4281-b951-d872f2087c98