Move data reduction proxy logic out of chrome and android webview network delegate

net/base/layered_network_delegate.h

Index: net/base/layered_network_delegate.h
diff --git a/net/base/layered_network_delegate.h b/net/base/layered_network_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..5b450adfdec2b5d28e70614850731a358736f934
--- /dev/null
+++ b/net/base/layered_network_delegate.h
@@ -0,0 +1,171 @@
+// Copyright 2014 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 NET_BASE_LAYERED_NETWORK_DELEGATE_H_
+#define NET_BASE_LAYERED_NETWORK_DELEGATE_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/strings/string16.h"
+#include "net/base/completion_callback.h"
+#include "net/base/network_delegate.h"
+#include "net/cookies/canonical_cookie.h"
+
+class GURL;
+
+namespace base {
+class FilePath;
+}
+
+namespace net {
+
+class CookieOptions;
+class HttpRequestHeaders;
+class HttpResponseHeaders;
+class ProxyInfo;
+class ProxyServer;
+class ProxyService;
+class URLRequest;
+
+// WrappingNetworkDelegate takes a |network_delegate| and extends it. When
+// On*() is called, the On*Internal() method of this is first called and then
+// the On*() of |network_delegate| is called. On*Internal() methods have no
+// return values, and cannot prevent calling into the nested network delegate.
+class NET_EXPORT LayeredNetworkDelegate : public NetworkDelegate {
+ public:
+  explicit LayeredNetworkDelegate(
+      scoped_ptr<NetworkDelegate> nested_network_delegate);
+  ~LayeredNetworkDelegate() override;
+
+  // NetworkDelegate implementation:
+  int OnBeforeURLRequest(URLRequest* request,
+                         const CompletionCallback& callback,
+                         GURL* new_url) final override;
+  void OnResolveProxy(const GURL& url,
+                      int load_flags,
+                      const ProxyService& proxy_service,
+                      ProxyInfo* result) final override;
+  void OnProxyFallback(const ProxyServer& bad_proxy,
+                       int net_error) final override;
+  int OnBeforeSendHeaders(URLRequest* request,
+                          const CompletionCallback& callback,
+                          HttpRequestHeaders* headers) final override;
+  void OnBeforeSendProxyHeaders(URLRequest* request,
+                                const ProxyInfo& proxy_info,
+                                HttpRequestHeaders* headers) final override;
+  void OnSendHeaders(URLRequest* request,
+                     const HttpRequestHeaders& headers) final override;
+  int OnHeadersReceived(
+      URLRequest* request,
+      const CompletionCallback& callback,
+      const HttpResponseHeaders* original_response_headers,
+      scoped_refptr<HttpResponseHeaders>* override_response_headers,
+      GURL* allowed_unsafe_redirect_url) final override;
+  void OnBeforeRedirect(URLRequest* request,
+                        const GURL& new_location) final override;
+  void OnResponseStarted(URLRequest* request) final override;
+  void OnRawBytesRead(const URLRequest& request, int bytes_read) final override;
+  void OnCompleted(URLRequest* request, bool started) final override;
+  void OnURLRequestDestroyed(URLRequest* request) final override;
+  void OnPACScriptError(int line_number,
+                        const base::string16& error) final override;
+  AuthRequiredResponse OnAuthRequired(
+      URLRequest* request,
+      const AuthChallengeInfo& auth_info,
+      const AuthCallback& callback,
+      AuthCredentials* credentials) final override;
+  bool OnCanGetCookies(const URLRequest& request,
+                       const CookieList& cookie_list) final override;
+  bool OnCanSetCookie(const URLRequest& request,
+                      const std::string& cookie_line,
+                      CookieOptions* options) final override;
+  bool OnCanAccessFile(const URLRequest& request,
+                       const base::FilePath& path) const final override;
+  bool OnCanThrottleRequest(const URLRequest& request) const final override;
+  bool OnCanEnablePrivacyMode(
+      const GURL& url,
+      const GURL& first_party_for_cookies) const final override;
+  bool OnCancelURLRequestWithPolicyViolatingReferrerHeader(
+      const URLRequest& request,
+      const GURL& target_url,
+      const GURL& referrer_url) const final override;
+
+  virtual void OnBeforeURLRequestInternal(URLRequest* request,
+                                          const CompletionCallback& callback,
+                                          GURL* new_url);
+
+  virtual void OnResolveProxyInternal(const GURL& url,
+                                      int load_flags,
+                                      const ProxyService& proxy_service,
+                                      ProxyInfo* result);
+
+  virtual void OnProxyFallbackInternal(const ProxyServer& bad_proxy,
+                                       int net_error);
+
+  virtual void OnBeforeSendHeadersInternal(URLRequest* request,
+                                           const CompletionCallback& callback,
+                                           HttpRequestHeaders* headers);
+
+  virtual void OnBeforeSendProxyHeadersInternal(URLRequest* request,
+                                                const ProxyInfo& proxy_info,
+                                                HttpRequestHeaders* headers);
+
+  virtual void OnSendHeadersInternal(URLRequest* request,
+                                     const HttpRequestHeaders& headers);
+
+  virtual void OnHeadersReceivedInternal(
+      URLRequest* request,
+      const CompletionCallback& callback,
+      const HttpResponseHeaders* original_response_headers,
+      scoped_refptr<HttpResponseHeaders>* override_response_headers,
+      GURL* allowed_unsafe_redirect_url);
+
+  virtual void OnBeforeRedirectInternal(URLRequest* request,
+                                        const GURL& new_location);
+
+  virtual void OnResponseStartedInternal(URLRequest* request);
+
+  virtual void OnRawBytesReadInternal(const URLRequest& request,
+                                      int bytes_read);
+
+  virtual void OnCompletedInternal(URLRequest* request, bool started);
+
+  virtual void OnURLRequestDestroyedInternal(URLRequest* request);
+
+  virtual void OnPACScriptErrorInternal(int line_number,
+                                        const base::string16& error);
+
+  virtual void OnCanGetCookiesInternal(const URLRequest& request,
+                                       const CookieList& cookie_list);
+
+  virtual void OnCanSetCookieInternal(const URLRequest& request,
+                                      const std::string& cookie_line,
+                                      CookieOptions* options);
+
+  virtual void OnAuthRequiredInternal(
+      URLRequest* request,
+      const AuthChallengeInfo& auth_info,
+      const AuthCallback& callback,
+      AuthCredentials* credentials);
+
+  virtual void OnCanAccessFileInternal(const URLRequest& request,
+                                       const base::FilePath& path) const;
+
+  virtual void OnCanThrottleRequestInternal(const URLRequest& request) const;
+
+  virtual void OnCanEnablePrivacyModeInternal(
+      const GURL& url,
+      const GURL& first_party_for_cookies) const;
+
+  virtual void OnCancelURLRequestWithPolicyViolatingReferrerHeaderInternal(
+      const URLRequest& request,
+      const GURL& target_url,
+      const GURL& referrer_url) const;
+
+ private:
+  scoped_ptr<NetworkDelegate> nested_network_delegate_;
+};
+
+}  // namespace net
+
+#endif  // NET_BASE_LAYERED_NETWORK_DELEGATE_H_