Add Finch experiment for selectively bypassing proxies.

chrome/browser/io_thread.h

Index: chrome/browser/io_thread.h
diff --git a/chrome/browser/io_thread.h b/chrome/browser/io_thread.h
index ca817394e8bc1f70737a68e7f1c24e5a117e1f9b..12f0c0730f226ff51241f44a01d3786f15de868a 100644
--- a/chrome/browser/io_thread.h
+++ b/chrome/browser/io_thread.h
@@ -15,6 +15,7 @@
 #include "base/memory/weak_ptr.h"
 #include "base/prefs/pref_member.h"
 #include "base/time/time.h"
+#include "chrome/browser/net/chrome_network_delegate.h"
 #include "chrome/browser/net/ssl_config_service_manager.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_auth_request_handler.h"
 #include "components/data_reduction_proxy/browser/data_reduction_proxy_params.h"
@@ -195,6 +196,8 @@ class IOThread : public content::BrowserThreadDelegate {
         data_reduction_proxy_usage_stats;
     scoped_ptr<data_reduction_proxy::DataReductionProxyAuthRequestHandler>
         data_reduction_proxy_auth_request_handler;
+    scoped_ptr<ChromeNetworkDelegate::OnResolveProxyHandler>
+        on_resolve_proxy_handler;
   };
 
   // |net_log| must either outlive the IOThread or be NULL.