Identify service worker version at main resource load time.

content/child/request_extra_data.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_CHILD_REQUEST_EXTRA_DATA_H_
 #define CONTENT_CHILD_REQUEST_EXTRA_DATA_H_
 
 #include "base/compiler_specific.h"
 #include "content/common/content_export.h"
 #include "content/public/common/page_transition_types.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/platform/WebURLRequest.h"
 #include "third_party/WebKit/public/web/WebPageVisibilityState.h"
 
 namespace content {
 
-// The RenderView stores an instance of this class in the "extra data" of each
-// ResourceRequest (see RenderFrameImpl::willSendRequest).
+// Can be used by callers to store extra data on every ResourceRequest
+// which will be incorporated into the ResourceHostMsg_Request message
+// sent by ResourceDispatcher.
 class CONTENT_EXPORT RequestExtraData
     : public NON_EXPORTED_BASE(blink::WebURLRequest::ExtraData) {
  public:
   RequestExtraData();
   virtual ~RequestExtraData();
 
   blink::WebPageVisibilityState visibility_state() const {
     return visibility_state_;
   }
   void set_visibility_state(blink::WebPageVisibilityState visibility_state) {
@@ skipping 87 matching lines @@
   int service_worker_provider_id_;
   blink::WebString custom_user_agent_;
   bool was_after_preconnect_request_;
 
   DISALLOW_COPY_AND_ASSIGN(RequestExtraData);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_REQUEST_EXTRA_DATA_H_