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 0e660e2a3de7642335af8f6bfdbea7612e794d35..448f217641ecfa1966129f290dc2d55f679475ef 100644
--- a/net/base/network_delegate.cc
+++ b/net/base/network_delegate.cc
@@ -21,6 +21,13 @@ 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) {
@@ -155,6 +162,10 @@ 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) {