Introduce EmbeddedWorkerDevToolsAgent.

content/common/service_worker/embedded_worker_messages.h

Index: content/common/service_worker/embedded_worker_messages.h
diff --git a/content/common/service_worker/embedded_worker_messages.h b/content/common/service_worker/embedded_worker_messages.h
index e9570950abaa76972e34c90f54d80f81fb983970..5c6f8ced7fcda5884f1806dc7db2b00b3709e861 100644
--- a/content/common/service_worker/embedded_worker_messages.h
+++ b/content/common/service_worker/embedded_worker_messages.h
@@ -38,6 +38,10 @@ IPC_MESSAGE_CONTROL4(EmbeddedWorkerMsg_StartWorker,
 IPC_MESSAGE_CONTROL1(EmbeddedWorkerMsg_StopWorker,
                      int /* embedded_worker_id */)
 
+IPC_MESSAGE_CONTROL2(EmbeddedWorkerMsg_MessageToWorker,
+                     int /* embedded_worker_id */,
+                     IPC::Message /* message */)

[kinuko, 2014/04/25 04:38:01]

I found that DevToolsAgentMsg_* are existing messages and we use similar nested
messaging to deliver them to SharedWorker, but these DevToolsAgentMsgs are
routed, why don't we use routing_id to send it to the target worker here? (We're
in general trying to remove nested messaging from EmbeddedWorker code)

+
 // Renderer -> Browser message to indicate that the worker is started.
 IPC_MESSAGE_CONTROL2(EmbeddedWorkerHostMsg_WorkerStarted,
                      int /* thread_id */,