Change the Lo-Fi snackbar strings for Lo-Fi preview pages

components/data_reduction_proxy/core/common/lofi_ui_service.h

Index: components/data_reduction_proxy/core/common/lofi_ui_service.h
diff --git a/components/data_reduction_proxy/core/common/lofi_ui_service.h b/components/data_reduction_proxy/core/common/lofi_ui_service.h
index 656dab4de9bd51c2e39f9e14a1f06a79c4a6f3f2..d22473a01f4def7a41c9fe35d4873003cc7d441f 100644
--- a/components/data_reduction_proxy/core/common/lofi_ui_service.h
+++ b/components/data_reduction_proxy/core/common/lofi_ui_service.h
@@ -19,8 +19,10 @@ class LoFiUIService {
  public:
   virtual ~LoFiUIService() {}
 
-  // Notifies the UI thread that |request| has a Lo-Fi response.
-  virtual void OnLoFiReponseReceived(const net::URLRequest& request) = 0;
+  // Notifies the UI thread that |request| has a Lo-Fi response. |is_preview|
+  // indicates whether the response was a Lo-Fi preview response.
+  virtual void OnLoFiReponseReceived(const net::URLRequest& request,
+                                     bool is_preview) = 0;
 };
 
 }  // namespace data_reduction_proxy