Add a runtime flag in WebRuntimeFeatures to enable 'image/webp' accept header

Source/WebKit/chromium/src/WebRuntimeFeatures.cpp

Index: Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
diff --git a/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp b/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
index 8c1b73bca93332c07bdb347e92578a96676e00ad..f1312b78be07034bcf56b4cbc2aa80dba28cbac1 100644
--- a/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
+++ b/Source/WebKit/chromium/src/WebRuntimeFeatures.cpp
@@ -686,4 +686,22 @@ bool WebRuntimeFeatures::isRequestAutocompleteEnabled()
 #endif
 }
 
+void WebRuntimeFeatures::enableWebPInAcceptHeader(bool enable)
+{
+#if USE(WEBP)
+    RuntimeEnabledFeatures::setWebPInAcceptHeaderEnabled(enable);
+#else
+    UNUSED_PARAM(enable);
+#endif
+}
+
+bool WebRuntimeFeatures::isWebPInAcceptHeaderEnabled()
+{
+#if USE(WEBP)
+    return RuntimeEnabledFeatures::webPInAcceptHeaderEnabled();
+#else
+    return false;
+#endif
+}
+
 } // namespace WebKit