Add Finch experiment for selectively bypassing proxies.

components/data_reduction_proxy/browser/data_reduction_proxy_params.h

Index: components/data_reduction_proxy/browser/data_reduction_proxy_params.h
diff --git a/components/data_reduction_proxy/browser/data_reduction_proxy_params.h b/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
index 5ae00b839485b3eed085aeecb62aeacdc5371a21..3989777e254250c56dbac1db6ffc92d791f43148 100644
--- a/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
+++ b/components/data_reduction_proxy/browser/data_reduction_proxy_params.h
@@ -49,6 +49,10 @@ class DataReductionProxyParams {
   // hinting.
   static bool IsIncludedInPreconnectHintingFieldTrial();
 
+  // Returns true if this client is part of a field trial that bypasses the
+  // proxy if the request resource type is on the critical path (e.g. HTML).
+  static bool IsIncludedInCriticalPathBypassFieldTrial();
+
   // Returns true if the authentication key was set on the command line.
   static bool IsKeySetOnCommandLine();