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

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 0f30095c89d091f6c228c165da3dbfc25179c593..be6a42a2f636e9dff588830468d107c571ea0fa5 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -437,7 +437,7 @@ class CONTENT_EXPORT RenderFrameImpl
                                       v8::Local<v8::Context> context) override;
   void AddMessageToConsole(ConsoleMessageLevel level,
                            const std::string& message) override;
-  bool IsUsingLoFi() const override;
+  int GetPreviewsState() const override;
   bool IsPasting() const override;
   blink::WebPageVisibilityState GetVisibilityState() const override;
   bool IsBrowserSideNavigationPending() override;
@@ -1281,8 +1281,9 @@ class CONTENT_EXPORT RenderFrameImpl
   // lifetime is tied to the RenderFrame via the RenderFrameObserver interface.
   media::RendererWebMediaPlayerDelegate* media_player_delegate_;
 
-  // Whether or not this RenderFrame is using Lo-Fi mode.
-  bool is_using_lofi_;
+  // The PreviewsState of this RenderFrame that indicates which Previews are
+  // being used.
+  int previews_state_;
 
   // Effective connection type when the document of this frame was fetched.
   blink::WebEffectiveConnectionType effective_connection_type_;