Add Finch experiment for selectively bypassing proxies.

components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h

 // 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 COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_PROTOCOL_H_
 #define COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_PROTOCOL_H_
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 
 namespace base {
 class TimeDelta;
 }
 
 namespace net {
 class HttpResponseHeaders;
+class ProxyInfo;
 class ProxyServer;
 class URLRequest;
 }
 
 class GURL;
 
 namespace data_reduction_proxy {
 
 class DataReductionProxyParams;
 
 // Decides whether to mark the data reduction proxy as temporarily bad and
 // put it on the proxy retry list. Returns true if the request should be
 // retried. Sets |override_response_headers| to redirect if so.
 bool MaybeBypassProxyAndPrepareToRetry(
     const DataReductionProxyParams* params,
     net::URLRequest* request,
     const net::HttpResponseHeaders* original_response_headers,
     scoped_refptr<net::HttpResponseHeaders>* override_response_headers);
 
+// Upon |ProxyService.ResolveProxy()|, bypass if the effective proxy is the data

[bengr, 2014/07/07 16:28:14]

Say something about when this method is called. E.g., is it meant to be called
only from a particular method of NetworkDelegate? Also, be more specific about
what "bypass" means, because the meaning here is different from how "bypass" is
used in other data reduction proxy contexts. (Except for here, "bypass" means
put the proxy on the ProxyRetryInfo map.)

+// reduction proxy, the |net::LOAD_BYPASS_DATA_REDUCTION_PROXY| |load_flag| is
+// set, and the DataCompressionProxyCriticalBypass Finch trial is set.
+void OnResolveProxyHandler(const GURL& url,
+                           int load_flags,
+                           const DataReductionProxyParams* params,
+                           net::ProxyInfo* result);
+
 // Returns true if the request method is idempotent. Only idempotent requests
 // are retried on a bypass. Visible as part of the public API for testing.
 bool IsRequestIdempotent(const net::URLRequest* request);
 
 // Sets the override headers to contain a status line that indicates a
 // redirect (a 302), a "Location:" header that points to the request url,
 // and sets load flags to bypass proxies.
 // Visible as part of the public API for testing.
 void OverrideResponseAsRedirect(
     net::URLRequest* request,
     const net::HttpResponseHeaders* original_response_headers,
     scoped_refptr<net::HttpResponseHeaders>* override_response_headers);
 
 // Adds non-empty entries in |data_reduction_proxies| to the retry map
 // maintained by the proxy service of the request. Adds
 // |data_reduction_proxies.second| to the retry list only if |bypass_all| is
 // true. Visible as part of the public API for testing.
 void MarkProxiesAsBadUntil(net::URLRequest* request,
                            base::TimeDelta& bypass_duration,
                            bool bypass_all,
                            const std::pair<GURL, GURL>& data_reduction_proxies);
 
 }  // namespace data_reduction_proxy
 #endif  // COMPONENTS_DATA_REDUCTION_PROXY_BROWSER_DATA_REDUCTION_PROXY_PROTOCOL_H_