Add support for field trial group to relax missing via header bypass logic.

components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
index c435c958e09ec04df3da96cd1361db1abcfc8a48..9ef087b0ced722e1a3e74496f1086a6f95932406 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_network_delegate.cc
@@ -11,10 +11,12 @@
 #include "base/strings/string_number_conversions.h"
 #include "base/time/time.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_auth_request_handler.h"
-#include "components/data_reduction_proxy/core/browser/data_reduction_proxy_protocol.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_statistics_prefs.h"
 #include "components/data_reduction_proxy/core/browser/data_reduction_proxy_usage_stats.h"
+#include "net/base/load_flags.h"
 #include "net/http/http_response_headers.h"
+#include "net/proxy/proxy_info.h"
+#include "net/proxy/proxy_server.h"
 #include "net/proxy/proxy_service.h"
 #include "net/url_request/url_request.h"
 #include "net/url_request/url_request_status.h"
@@ -145,6 +147,8 @@ void DataReductionProxyNetworkDelegate::OnResolveProxyInternal(
     int load_flags,
     const net::ProxyService& proxy_service,
     net::ProxyInfo* result) {
+  // TODO(sclittle): Call OnResolveProxyHandler directly, see
+  // http://crbug.com/447346.
   if (!on_resolve_proxy_handler_.is_null() &&
       !proxy_config_getter_.is_null()) {
     on_resolve_proxy_handler_.Run(
@@ -251,4 +255,37 @@ void DataReductionProxyNetworkDelegate::AccumulateContentLength(
   original_content_length_ += original_content_length;
 }
 
+void OnResolveProxyHandler(const GURL& url,
+                           int load_flags,
+                           const net::ProxyConfig& data_reduction_proxy_config,
+                           const net::ProxyRetryInfoMap& proxy_retry_info,
+                           const DataReductionProxyParams* params,
+                           net::ProxyInfo* result) {
+  DCHECK(params);
+  DCHECK(result->is_empty() || result->is_direct() ||
+         !params->IsDataReductionProxy(result->proxy_server().host_port_pair(),
+                                       NULL));
+  if (data_reduction_proxy_config.is_valid() &&
+      result->proxy_server().is_direct() &&
+      result->proxy_list().size() == 1 &&
+      !url.SchemeIsWSOrWSS()) {
+    net::ProxyInfo data_reduction_proxy_info;
+    data_reduction_proxy_config.proxy_rules().Apply(
+        url, &data_reduction_proxy_info);
+    data_reduction_proxy_info.DeprioritizeBadProxies(proxy_retry_info);
+    if (!data_reduction_proxy_info.proxy_server().is_direct())
+      result->OverrideProxyList(data_reduction_proxy_info.proxy_list());
+  }
+
+  if ((load_flags & net::LOAD_BYPASS_DATA_REDUCTION_PROXY) &&
+      DataReductionProxyParams::IsIncludedInCriticalPathBypassFieldTrial()) {
+    if (!result->is_empty() &&
+        !result->is_direct() &&
+        params->IsDataReductionProxy(result->proxy_server().host_port_pair(),
+                                     NULL)) {
+      result->RemoveProxiesWithoutScheme(net::ProxyServer::SCHEME_DIRECT);
+    }
+  }
+}
+
 }  // namespace data_reduction_proxy