Adding slightly clearer separation between SW and EmbeddedWorker (still incomplete)

content/common/service_worker/service_worker_messages.h

Index: content/common/service_worker/service_worker_messages.h
diff --git a/content/common/service_worker/service_worker_messages.h b/content/common/service_worker/service_worker_messages.h
index be11cbed4572bd1edbcce2923d5ccbac954b16c6..84e87f47ad4fc16d264eb17d715b3fa8728234c5 100644
--- a/content/common/service_worker/service_worker_messages.h
+++ b/content/common/service_worker/service_worker_messages.h
@@ -5,6 +5,7 @@
 // Message definition file, included multiple times, hence no include guard.
 
 #include "base/strings/string16.h"
+#include "content/common/service_worker/service_worker_types.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_param_traits.h"
 #include "third_party/WebKit/public/platform/WebServiceWorkerError.h"
@@ -17,6 +18,12 @@
 
 IPC_ENUM_TRAITS(blink::WebServiceWorkerError::ErrorType)
 
+IPC_STRUCT_TRAITS_BEGIN(content::ServiceWorkerFetchRequest)
+  IPC_STRUCT_TRAITS_MEMBER(url)
+  IPC_STRUCT_TRAITS_MEMBER(method)
+  IPC_STRUCT_TRAITS_MEMBER(headers)
+IPC_STRUCT_TRAITS_END()
+
 // Messages sent from the child process to the browser.
 
 IPC_MESSAGE_CONTROL4(ServiceWorkerHostMsg_RegisterServiceWorker,
@@ -51,6 +58,10 @@ IPC_MESSAGE_CONTROL4(ServiceWorkerMsg_ServiceWorkerRegistrationError,
                      blink::WebServiceWorkerError::ErrorType /* code */,
                      base::string16 /* message */)
 
+// Sent via EmbeddedWorker to dispatch fetch event.
+IPC_MESSAGE_CONTROL1(ServiceWorkerMsg_FetchEvent,
+                     content::ServiceWorkerFetchRequest)
+
 // Informs the browser of a new ServiceWorkerProvider in the child process,
 // |provider_id| is unique within its child process.
 IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_ProviderCreated,