request for pdf resource from the webui

atom/browser/loader/layered_resource_handler.h

@@ -0,0 +1,40 @@
+// Copyright (c) 2017 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#ifndef ATOM_BROWSER_LOADER_LAYERED_RESOURCE_HANDLER_H_
+#define ATOM_BROWSER_LOADER_LAYERED_RESOURCE_HANDLER_H_
+
+#include "content/browser/loader/layered_resource_handler.h"
+
+namespace atom {
+
+// Resource handler that notifies on various stages of a resource request.
+class LayeredResourceHandler : public content::LayeredResourceHandler {
+ public:
+  class Delegate {
+   public:
+    Delegate() {}
+    virtual ~Delegate() {}
+
+    virtual void OnResponseStarted(content::ResourceResponse* response) = 0;
+  };
+
+  LayeredResourceHandler(net::URLRequest* request,
+                         std::unique_ptr<content::ResourceHandler> next_handler,
+                         Delegate* delegate);
+  ~LayeredResourceHandler() override;
+
+  // content::LayeredResourceHandler:
+  bool OnResponseStarted(content::ResourceResponse* response,
+                         bool* defer) override;
+
+ private:
+  Delegate* delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(LayeredResourceHandler);
+};
+
+}  // namespace atom
+
+#endif  // ATOM_BROWSER_LOADER_LAYERED_RESOURCE_HANDLER_H_