Network service: Safe browsing check for sub-resources from renderer.

content/public/child/url_loader_throttle.h

+// Copyright 2017 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_PUBLIC_RENDERER_URL_LOADER_THROTTLE_H_
+#define CONTENT_PUBLIC_RENDERER_URL_LOADER_THROTTLE_H_
+
+#include "content/common/content_export.h"
+#include "content/public/common/resource_type.h"
+
+class GURL;
+
+namespace net {
+struct RedirectInfo;
+}
+
+namespace content {
+
+// A URLLoaderThrottle gets notified at various points during the process of
+// loading a resource. At each stage, it has the opportunity to defer the
+// resource load.
+class CONTENT_EXPORT URLLoaderThrottle {
+ public:
+  // An interface for the throttle implementation to resume (when deferred) or
+  // cancel the resource load.
+  class CONTENT_EXPORT Delegate {
+   public:
+    // Cancels the resource load with the specified error code.
+    virtual void CancelWithError(int error_code) = 0;
+
+    // Resumes the deferred resource load. It is a no-op if the resource load is
+    // not deferred or has already been canceled.
+    virtual void Resume() = 0;
+
+   protected:
+    virtual ~Delegate() {}
+  };
+
+  virtual ~URLLoaderThrottle() {}
+
+  // Called before the resource request is started.
+  virtual void WillStartRequest(const GURL& url,
+                                int load_flags,
+                                ResourceType resource_type,
+                                bool* defer) {}
+
+  // Called when the request was redirected.  |redirect_info| contains the
+  // redirect responses's HTTP status code and some information about the new
+  // request that will be sent if the redirect is followed, including the new
+  // URL and new method.
+  virtual void WillRedirectRequest(const net::RedirectInfo& redirect_info,
+                                   bool* defer) {}
+
+  // Called when the response headers and meta data are available.
+  virtual void WillProcessResponse(bool* defer) {}
+
+  void set_delegate(Delegate* delegate) { delegate_ = delegate; }
+
+ protected:
+  URLLoaderThrottle() = default;
+
+  Delegate* delegate_ = nullptr;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_RENDERER_URL_LOADER_THROTTLE_H_