Provide skeleton functionality for AppCache handling in the network service.

content/browser/appcache/appcache_job.h

Index: content/browser/appcache/appcache_job.h
diff --git a/content/browser/appcache/appcache_job.h b/content/browser/appcache/appcache_job.h
index a28bc3318e16d9df45a49ed046e4653e61dbc3f2..bc7a14b83b01c72b0427612472ec0d8208a74021 100644
--- a/content/browser/appcache/appcache_job.h
+++ b/content/browser/appcache/appcache_job.h
@@ -25,6 +25,7 @@ class AppCacheEntry;
 class AppCacheHost;
 class AppCacheRequest;
 class AppCacheStorage;
+class AppCacheURLLoaderJob;
 class URLRequestJob;
 
 // Interface for an AppCache job. This is used to send data stored in the
@@ -100,9 +101,13 @@ class CONTENT_EXPORT AppCacheJob
   virtual const GURL& GetURL() const = 0;
 
   // Returns the underlying URLRequestJob if any. This only applies to
-  // AppCaches loaded via the URLRequest mechanism.
+  // AppCaches loaded via the URLLoader mechanism.
   virtual net::URLRequestJob* AsURLRequestJob();
 
+  // Returns the underlying ApppCacheURLLoaderJob if any. This only applies to
+  // AppCaches loaded via the URLRequest mechanism.
+  virtual AppCacheURLLoaderJob* AsURLLoaderJob();
+
  protected:
   AppCacheJob();