[WIP not ready for review] ServiceWorker Download support.

content/common/frame_messages.h

Index: content/common/frame_messages.h
diff --git a/content/common/frame_messages.h b/content/common/frame_messages.h
index e9dbe90de58341429b39ee047da83d78b69cdfd9..d7d58aef6ee15efa3a26caae440d06e97b7f3cde 100644
--- a/content/common/frame_messages.h
+++ b/content/common/frame_messages.h
@@ -578,6 +578,15 @@ IPC_STRUCT_TRAITS_BEGIN(content::PepperRendererInstanceData)
 IPC_STRUCT_TRAITS_END()
 #endif
 
+IPC_STRUCT_BEGIN(FrameHostMsg_DownloadUrl_Params)
+  IPC_STRUCT_MEMBER(int32_t, render_view_id)
+  IPC_STRUCT_MEMBER(int32_t, render_frame_id)
+  IPC_STRUCT_MEMBER(int32_t, service_worker_provider_id)
+  IPC_STRUCT_MEMBER(GURL, url)
+  IPC_STRUCT_MEMBER(content::Referrer, referrer)
+  IPC_STRUCT_MEMBER(base::string16, suggested_name)
+IPC_STRUCT_END()
+
 // -----------------------------------------------------------------------------
 // Messages sent from the browser to the renderer.
 
@@ -1037,12 +1046,7 @@ IPC_MESSAGE_ROUTED1(FrameHostMsg_DidFinishLoad,
                     GURL /* validated_url */)
 
 // Initiates a download based on user actions like 'ALT+click'.
-IPC_MESSAGE_CONTROL5(FrameHostMsg_DownloadUrl,
-                     int /* render_view_id */,
-                     int /* render_frame_id */,
-                     GURL /* url */,
-                     content::Referrer /* referrer */,
-                     base::string16 /* suggested_name */)
+IPC_MESSAGE_CONTROL1(FrameHostMsg_DownloadUrl, FrameHostMsg_DownloadUrl_Params)
 
 // Asks the browser to save a image (for <canvas> or <img>) from a data URL.
 // Note: |data_url| is the contents of a data:URL, and that it's represented as