Split RW hint into Width and Viewport-Width

Source/core/fetch/ClientHintsPreferences.cpp

Index: Source/core/fetch/ClientHintsPreferences.cpp
diff --git a/Source/core/fetch/ClientHintsPreferences.cpp b/Source/core/fetch/ClientHintsPreferences.cpp
index 266995fb33e98975d5fc667a619ff31bea49d9da..1f4c25e0e4f9103d64fc2b3b023b902629513ed6 100644
--- a/Source/core/fetch/ClientHintsPreferences.cpp
+++ b/Source/core/fetch/ClientHintsPreferences.cpp
@@ -12,14 +12,18 @@ namespace blink {
 
 void handleAcceptClientHintsHeader(const String& headerValue, ClientHintsPreferences& preferences)
 {
-    if (RuntimeEnabledFeatures::clientHintsEnabled()) {
-        CommaDelimitedHeaderSet acceptCH;
-        parseCommaDelimitedHeader(headerValue, acceptCH);
-        if (acceptCH.contains("dpr"))
-            preferences.setShouldSendDPR(true);
-        if (acceptCH.contains("rw"))
-            preferences.setShouldSendRW(true);
-    }
+    if (!RuntimeEnabledFeatures::clientHintsEnabled() || headerValue.isEmpty())
+        return;
+    CommaDelimitedHeaderSet acceptCH;
+    parseCommaDelimitedHeader(headerValue, acceptCH);
+    if (acceptCH.contains("dpr"))
+        preferences.setShouldSendDPR(true);
+
+    if (acceptCH.contains("width"))
+        preferences.setShouldSendResourceWidth(true);
+
+    if (acceptCH.contains("viewport-width"))
+        preferences.setShouldSendViewportWidth(true);
 }
 
 }