Context menu item to view original image when Data Saver is being used.

components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc

Index: components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
diff --git a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
index 081c49f51c26d0f8f7b01d37b1d9fdd17739d8b7..534e60d547b4ea1b180cf60ae5bd5b8e694556ab 100644
--- a/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
+++ b/components/data_reduction_proxy/core/browser/data_reduction_proxy_settings.cc
@@ -47,6 +47,9 @@ bool IsEnabledOnCommandLine() {
 
 namespace data_reduction_proxy {
 
+const char kDataReductionPassThroughHeader[] =
+    "X-PSA-Client-Options: v=1,m=1\nCache-Control: no-cache";
+
 DataReductionProxySettings::DataReductionProxySettings()
     : unreachable_(false),
       allowed_(false),
@@ -110,10 +113,16 @@ void DataReductionProxySettings::SetOnDataReductionEnabledCallback(
   on_data_reduction_proxy_enabled_.Run(IsDataReductionProxyEnabled());
 }
 
-bool DataReductionProxySettings::IsDataReductionProxyEnabled() {
+bool DataReductionProxySettings::IsDataReductionProxyEnabled() const {
   return spdy_proxy_auth_enabled_.GetValue() || IsEnabledOnCommandLine();
 }
 
+bool DataReductionProxySettings::CanUseDataReductionProxy(
+    const GURL& url) const {
+  return url.is_valid() && url.scheme() == url::kHttpScheme &&
+      IsDataReductionProxyEnabled();
+}
+
 bool
 DataReductionProxySettings::IsDataReductionProxyAlternativeEnabled() const {
   return data_reduction_proxy_alternative_enabled_.GetValue();