Revert of Revert of Fix CH Width header when preloadScanner and <picture> are involved

Source/core/html/parser/HTMLPreloadScanner.h

Index: Source/core/html/parser/HTMLPreloadScanner.h
diff --git a/Source/core/html/parser/HTMLPreloadScanner.h b/Source/core/html/parser/HTMLPreloadScanner.h
index 105818d6553f6b794409d26ace34a99b27fa8cd8..50acb47f509194b73b987c8d0c2d80e6cb548ae9 100644
--- a/Source/core/html/parser/HTMLPreloadScanner.h
+++ b/Source/core/html/parser/HTMLPreloadScanner.h
@@ -109,6 +109,19 @@
         size_t templateCount;
     };
 
+    struct PictureData {
+        PictureData()
+            : sourceSize(0.0)
+            , sourceSizeSet(false)
+            , picked(false)
+        {
+        }
+        String sourceURL;
+        float sourceSize;
+        bool sourceSizeSet;
+        bool picked;
+    };
+
     CSSPreloadScanner m_cssScanner;
     const KURL m_documentURL;
     KURL m_predictedBaseElementURL;
@@ -116,7 +129,7 @@
     bool m_inPicture;
     bool m_isAppCacheEnabled;
     bool m_isCSPEnabled;
-    String m_pictureSourceURL;
+    PictureData m_pictureData;
     size_t m_templateCount;
     OwnPtr<CachedDocumentParameters> m_documentParameters;
     ClientHintsPreferences m_clientHintsPreferences;