Add support for subresource request fallback in AppCache for the network service..

content/browser/appcache/appcache_url_loader_request.h

Index: content/browser/appcache/appcache_url_loader_request.h
diff --git a/content/browser/appcache/appcache_url_loader_request.h b/content/browser/appcache/appcache_url_loader_request.h
index 83fca4121017cb8f321252c28a6c11b393880e2d..d0435c72b47d4dac986481dc9c61c92dcf9ba0a3 100644
--- a/content/browser/appcache/appcache_url_loader_request.h
+++ b/content/browser/appcache/appcache_url_loader_request.h
@@ -7,6 +7,7 @@
 
 #include "content/browser/appcache/appcache_request.h"
 #include "content/public/common/resource_request.h"
+#include "content/public/common/resource_response.h"
 
 namespace content {
 
@@ -39,12 +40,18 @@ class CONTENT_EXPORT AppCacheURLLoaderRequest : public AppCacheRequest {
   int GetResponseCode() const override;
   std::string GetResponseHeaderByName(const std::string& name) const override;
   ResourceRequest* GetResourceRequest() override;
+  AppCacheURLLoaderRequest* AsURLLoaderRequest() override;
+
+  void set_response(const ResourceResponseHead& response) {
+    response_ = response;
+  }
 
  protected:
   explicit AppCacheURLLoaderRequest(const ResourceRequest& request);
 
  private:
   ResourceRequest request_;
+  ResourceResponseHead response_;
 
   DISALLOW_COPY_AND_ASSIGN(AppCacheURLLoaderRequest);
 };