Adding the Previews infobar to pages that show a client LoFi image

components/data_reduction_proxy/core/common/lofi_decider.h

Index: components/data_reduction_proxy/core/common/lofi_decider.h
diff --git a/components/data_reduction_proxy/core/common/lofi_decider.h b/components/data_reduction_proxy/core/common/lofi_decider.h
index 2eca7590fdb2d5545c9dd490b95edeecfb31c5ef..c0b3858cbaec06680412dcea48412c84810ad3bd 100644
--- a/components/data_reduction_proxy/core/common/lofi_decider.h
+++ b/components/data_reduction_proxy/core/common/lofi_decider.h
@@ -63,6 +63,10 @@ class LoFiDecider {
   // true if Lo-Fi is enabled for |request|, Chrome session is in Lo-Fi
   // Enabled or Control field trial, and the network quality was slow.
   virtual bool ShouldRecordLoFiUMA(const net::URLRequest& request) const = 0;
+
+  // Returns whether the request was a client-side Lo-Fi image request.
+  virtual bool IsClientLoFiImageRequest(
+      const net::URLRequest& request) const = 0;
 };
 
 }  // namespace data_reduction_proxy