Add Finch experiment for selectively bypassing proxies.

net/base/network_delegate.h

Index: net/base/network_delegate.h
diff --git a/net/base/network_delegate.h b/net/base/network_delegate.h
index fb5a4da4e69670a4c0105f4e681eeba581374204..aa8fa9a3c4f860640d3e723f8e85569ae530bb92 100644
--- a/net/base/network_delegate.h
+++ b/net/base/network_delegate.h
@@ -61,6 +61,8 @@ class NET_EXPORT NetworkDelegate : public base::NonThreadSafe {
   int NotifyBeforeURLRequest(URLRequest* request,
                              const CompletionCallback& callback,
                              GURL* new_url);
+  void NotifyResolveProxy(const GURL& url, int load_flags,
+                          ProxyInfo* result);
   int NotifyBeforeSendHeaders(URLRequest* request,
                               const CompletionCallback& callback,
                               HttpRequestHeaders* headers);
@@ -121,6 +123,13 @@ class NET_EXPORT NetworkDelegate : public base::NonThreadSafe {
                                  const CompletionCallback& callback,
                                  GURL* new_url);
 
+  // Called as the proxy is being resolved for |url|. Allows the delegate to
+  // override the proxy resolution decision made by ProxyService. The delegate
+  // may override the decision by modifying the ProxyInfo |result|.
+  virtual void OnResolveProxy(const GURL& url,
+                              int load_flags,
+                              ProxyInfo* result);
+
   // Called right before the HTTP headers are sent. Allows the delegate to
   // read/write |headers| before they get sent out. |callback| and |headers| are
   // valid only until OnCompleted or OnURLRequestDestroyed is called for this