Display JPGs in Viewer with Split Screen and ColorSpaceXform

tools/viewer/Viewer.h

Index: tools/viewer/Viewer.h
diff --git a/tools/viewer/Viewer.h b/tools/viewer/Viewer.h
index af3b6ce88d751789e526820bec00271fad518158..e140e1b87a395f3894aa482827cf9c3865819972 100644
--- a/tools/viewer/Viewer.h
+++ b/tools/viewer/Viewer.h
@@ -35,6 +35,7 @@ private:
 
     void updateUIState();
 
+    void drawSlide(SkCanvas* canvs, bool inSplitScreen);
     void drawStats(SkCanvas* canvas);
 
     void changeZoomLevel(float delta);
@@ -52,6 +53,9 @@ private:
 
     bool                   fDisplayStats;
 
+    // whether to split the screen and draw two copies of the slide, one with sRGB and one without
+    bool                   fSplitScreen;
+
     sk_app::Window::BackendType fBackendType;
 
     // transform data