Enable WebGL rendering into ImageCHROMIUM, backed by a scanout buffer to enable overlay suppor…

Source/web/WebRuntimeFeatures.cpp

Index: Source/web/WebRuntimeFeatures.cpp
diff --git a/Source/web/WebRuntimeFeatures.cpp b/Source/web/WebRuntimeFeatures.cpp
index fd41767d4ce50318d23b4acb91bbe56ff1a49c17..cd275020da18eb037f92319aa6b0441d160a4738 100644
--- a/Source/web/WebRuntimeFeatures.cpp
+++ b/Source/web/WebRuntimeFeatures.cpp
@@ -231,6 +231,11 @@ void WebRuntimeFeatures::enableWebGLDraftExtensions(bool enable)
     RuntimeEnabledFeatures::setWebGLDraftExtensionsEnabled(enable);
 }
 
+void WebRuntimeFeatures::enableWebGLImageChromium(bool enable)
+{
+    RuntimeEnabledFeatures::setWebGLImageChromiumEnabled(enable);
+}
+
 void WebRuntimeFeatures::enableWebMIDI(bool enable)
 {
     return RuntimeEnabledFeatures::setWebMIDIEnabled(enable);