Make document.rootScroller into an origin trial

third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "bindings/core/v8/ConditionalFeatures.h"
 
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/V8Document.h"
 #include "bindings/core/v8/V8HTMLLinkElement.h"
 #include "bindings/core/v8/V8Navigator.h"
@@ skipping 27 matching lines @@
           interfaceObject);
     }
   } else if (wrapperTypeInfo == &V8Window::wrapperTypeInfo) {
     v8::Local<v8::Object> instanceObject = scriptState->context()->Global();
     if (RuntimeEnabledFeatures::longTaskObserverEnabled() ||
         (originTrialContext &&
          originTrialContext->isTrialEnabled("LongTaskObserver"))) {
       V8Window::installLongTaskObserver(isolate, world, instanceObject,
                                         prototypeObject, interfaceObject);
     }
+  } else if (wrapperTypeInfo == &V8Document::wrapperTypeInfo) {
+    if (RuntimeEnabledFeatures::setRootScrollerEnabled() ||
+        (originTrialContext &&
+         originTrialContext->isTrialEnabled("RootScroller"))) {
+      V8Document::installRootScroller(isolate, world, v8::Local<v8::Object>(),
+                                      prototypeObject, interfaceObject);
+    }
   }
 }
 
 namespace {
 
 InstallConditionalFeaturesFunction s_installConditionalFeaturesFunction =
     &installConditionalFeaturesCore;
 }
 
 InstallConditionalFeaturesFunction setInstallConditionalFeaturesFunction(
@@ skipping 34 matching lines @@
   FeaturePolicy* featurePolicy = frame->securityContext()->getFeaturePolicy();
   // The policy should always be initialized before checking it to ensure we
   // properly inherit the parent policy.
   DCHECK(featurePolicy);
 
   // Otherwise, check policy.
   return featurePolicy->isFeatureEnabled(feature);
 }
 
 }  // namespace blink