Add Finch experiment for selectively bypassing proxies.

components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h b/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h
index 5598c26acc7f34ff35aa7ad5fb8a8bf6fa9da71e..53722f4c220a6f01ab58fdaa852441cdc3fbebf5 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_protocol.h
@@ -16,6 +16,7 @@ namespace net {
 class HttpResponseHeaders;
 class ProxyServer;
 class URLRequest;
+class ProxyInfo;
 }
 
 class GURL;
@@ -33,6 +34,12 @@ bool MaybeBypassProxyAndPrepareToRetry(
     const net::HttpResponseHeaders* original_response_headers,
     scoped_refptr<net::HttpResponseHeaders>* override_response_headers);
 
+// Upon ProxyService.ResolveProxy(), bypass if the effective proxy is the data
+// 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,
+                           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);