Add Finch experiment for selectively bypassing proxies.

net/base/network_delegate.cc

Index: net/base/network_delegate.cc
diff --git a/net/base/network_delegate.cc b/net/base/network_delegate.cc
index d30a4ab4c88db1a56c850ebdcdb106cf30061805..d70595ad20571e00aaa29acd5949c490216d0177 100644
--- a/net/base/network_delegate.cc
+++ b/net/base/network_delegate.cc
@@ -20,6 +20,13 @@ int NetworkDelegate::NotifyBeforeURLRequest(
   return OnBeforeURLRequest(request, callback, new_url);
 }
 
+void NetworkDelegate::NotifyResolveProxy(const GURL& url, int load_flags,
+     ProxyInfo* result) {
+  DCHECK(CalledOnValidThread());
+  DCHECK(result);
+  OnResolveProxy(url, load_flags, result);
+}
+
 int NetworkDelegate::NotifyBeforeSendHeaders(
     URLRequest* request, const CompletionCallback& callback,
     HttpRequestHeaders* headers) {
@@ -145,6 +152,10 @@ int NetworkDelegate::OnBeforeURLRequest(URLRequest* request,
   return OK;
 }
 
+void NetworkDelegate::OnResolveProxy(const GURL& url, int load_flags,
+                                     ProxyInfo* result) {
+}
+
 int NetworkDelegate::OnBeforeSendHeaders(URLRequest* request,
                                          const CompletionCallback& callback,
                                          HttpRequestHeaders* headers) {