Add Finch experiment for selectively bypassing proxies.

net/base/network_delegate.h

 // Copyright (c) 2012 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_NETWORK_DELEGATE_H_
 #define NET_BASE_NETWORK_DELEGATE_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 43 matching lines @@
 
   virtual ~NetworkDelegate() {}
 
   // Notification interface called by the network stack. Note that these
   // functions mostly forward to the private virtuals. They also add some sanity
   // checking on parameters. See the corresponding virtuals for explanations of
   // the methods and their arguments.
   int NotifyBeforeURLRequest(URLRequest* request,
                              const CompletionCallback& callback,
                              GURL* new_url);
+  void NotifyResolveProxy(const GURL& url, int load_flags,
+                          ProxyInfo* result);
   int NotifyBeforeSendHeaders(URLRequest* request,
                               const CompletionCallback& callback,
                               HttpRequestHeaders* headers);
   void NotifyBeforeSendProxyHeaders(URLRequest* request,
                                     const ProxyInfo& proxy_info,
                                     HttpRequestHeaders* headers);
   void NotifySendHeaders(URLRequest* request,
                          const HttpRequestHeaders& headers);
   int NotifyHeadersReceived(
       URLRequest* request,
@@ skipping 40 matching lines @@
   // called for this request. Returns a net status code, generally either OK to
   // continue with the request or ERR_IO_PENDING if the result is not ready yet.
   // A status code other than OK and ERR_IO_PENDING will cancel the request and
   // report the status code as the reason.
   //
   // The default implementation returns OK (continue with request).
   virtual int OnBeforeURLRequest(URLRequest* request,
                                  const CompletionCallback& callback,
                                  GURL* new_url);
 
+  // Called as the proxy is being resolved for |url|. Allows the delegate to
+  // override the proxy resolution decision made by ProxyService. The delegate
+  // may override the decision by modifying the ProxyInfo |result|.
+  virtual void OnResolveProxy(const GURL& url,
+                              int load_flags,
+                              ProxyInfo* result);
+
   // Called right before the HTTP headers are sent. Allows the delegate to
   // read/write |headers| before they get sent out. |callback| and |headers| are
   // valid only until OnCompleted or OnURLRequestDestroyed is called for this
   // request.
   // See OnBeforeURLRequest for return value description. Returns OK by default.
   virtual int OnBeforeSendHeaders(URLRequest* request,
                                   const CompletionCallback& callback,
                                   HttpRequestHeaders* headers);
 
   // Called after a proxy connection. Allows the delegate to read/write
@@ skipping 111 matching lines @@
 
   // Called before a SocketStream tries to connect.
   // See OnBeforeURLRequest for return value description. Returns OK by default.
   virtual int OnBeforeSocketStreamConnect(
       SocketStream* socket, const CompletionCallback& callback);
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_NETWORK_DELEGATE_H_