Offline pages using NQE 2G Slow

components/previews/previews_experiments.h

Index: components/previews/previews_experiments.h
diff --git a/components/previews/previews_experiments.h b/components/previews/previews_experiments.h
index 2a79eb552f40ed4b28c17597b50e0574b1bb3f99..7fff9c476a9b0e332ae4c29b02335781ac4f72a2 100644
--- a/components/previews/previews_experiments.h
+++ b/components/previews/previews_experiments.h
@@ -7,13 +7,17 @@
 
 namespace previews {
 
 // Returns true if any client-side previews experiment is active.
 bool IsIncludedInClientSidePreviewsExperimentsFieldTrial();
 
 // Returns true if the field trial that should enable offline pages for
 // prohibitvely slow networks is active.
 bool IsOfflinePreviewsEnabled();
 
+// Sets the appropriate state for field trial and variations to imitate the
+// offline pages field trial.
+bool EnableOfflinePreviewsForTesting();
+
 }  // namespace previews
 
 #endif  // COMPONENTS_PREVIEWS_PREVIEWS_EXPERIMENTS_H_