Add a feature for not compositing small scrollers

third_party/WebKit/Source/platform/exported/WebRuntimeFeatures.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 222 matching lines @@
 }
 
 void WebRuntimeFeatures::EnablePointerEvent(bool enable) {
   RuntimeEnabledFeatures::SetPointerEventEnabled(enable);
 }
 
 void WebRuntimeFeatures::EnableScriptedSpeech(bool enable) {
   RuntimeEnabledFeatures::SetScriptedSpeechEnabled(enable);
 }
 
+void WebRuntimeFeatures::EnableSkipCompositingSmallScrollers(bool enable) {
+  RuntimeEnabledFeatures::SetSkipCompositingSmallScrollersEnabled(enable);
+}
+
 void WebRuntimeFeatures::EnableSlimmingPaintV2(bool enable) {
   RuntimeEnabledFeatures::SetSlimmingPaintV2Enabled(enable);
 }
 
 void WebRuntimeFeatures::EnableSlimmingPaintInvalidation(bool enable) {
   RuntimeEnabledFeatures::SetSlimmingPaintInvalidationEnabled(enable);
 }
 
 void WebRuntimeFeatures::EnableTouchEventFeatureDetection(bool enable) {
   RuntimeEnabledFeatures::SetTouchEventFeatureDetectionEnabled(enable);
@@ skipping 151 matching lines @@
 
 void WebRuntimeFeatures::EnableRemotePlaybackBackend(bool enable) {
   RuntimeEnabledFeatures::SetRemotePlaybackBackendEnabled(enable);
 }
 
 void WebRuntimeFeatures::EnableMediaCastOverlayButton(bool enable) {
   RuntimeEnabledFeatures::SetMediaCastOverlayButtonEnabled(enable);
 }
 
 }  // namespace blink