Change Lo-Fi bool to bitmask to support multiple Previews types

content/child/weburlresponse_extradata_impl.h

Index: content/child/weburlresponse_extradata_impl.h
diff --git a/content/child/weburlresponse_extradata_impl.h b/content/child/weburlresponse_extradata_impl.h
index 000c9baa52a41008a78a3c6be824105b5a603c55..10f6f312fa01c7ca5c39fdb0b0d9bc4f58f32c42 100644
--- a/content/child/weburlresponse_extradata_impl.h
+++ b/content/child/weburlresponse_extradata_impl.h
@@ -68,8 +68,10 @@ class CONTENT_EXPORT WebURLResponseExtraDataImpl :
     is_ftp_directory_listing_ = is_ftp_directory_listing;
   }
 
-  bool is_using_lofi() const { return is_using_lofi_; }
-  void set_is_using_lofi(bool is_using_lofi) { is_using_lofi_ = is_using_lofi; }
+  int previews_state() const { return previews_state_; }
+  void set_previews_state(int previews_state) {
+    previews_state_ = previews_state;
+  }
 
   net::EffectiveConnectionType effective_connection_type() const {
     return effective_connection_type_;
@@ -86,7 +88,7 @@ class CONTENT_EXPORT WebURLResponseExtraDataImpl :
   bool was_alpn_negotiated_;
   net::HttpResponseInfo::ConnectionInfo connection_info_;
   bool was_alternate_protocol_available_;
-  bool is_using_lofi_;
+  int previews_state_;
   net::EffectiveConnectionType effective_connection_type_;
 
   DISALLOW_COPY_AND_ASSIGN(WebURLResponseExtraDataImpl);