Lazily install origin trial features on V8 objects

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

Index: third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp b/third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..3d25eade120a136b2567be9918186753e85a8a43
--- /dev/null
+++ b/third_party/WebKit/Source/bindings/core/v8/ConditionalFeatures.cpp
@@ -0,0 +1,50 @@
+// 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/V8HTMLLinkElement.h"
+#include "bindings/core/v8/V8Navigator.h"
+#include "bindings/core/v8/V8Window.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/origin_trials/OriginTrialContext.h"
+
+namespace blink {
+
+void installConditionalFeaturesCore(const WrapperTypeInfo* wrapperTypeInfo, const ScriptState* scriptState, v8::Local<v8::Object> prototypeObject, v8::Local<v8::Function> interfaceObject)
+{
+    // TODO(iclelland): Generate all of this logic at compile-time, based on the
+    // configuration of origin trial enabled attibutes and interfaces in IDL
+    // files. (crbug.com/615060)
+    ExecutionContext* executionContext = scriptState->getExecutionContext();
+    if (!executionContext)
+        return;
+    OriginTrialContext* originTrialContext = OriginTrialContext::from(executionContext, OriginTrialContext::DontCreateIfNotExists);
+    if (wrapperTypeInfo == &V8HTMLLinkElement::wrapperTypeInfo) {
+        if (RuntimeEnabledFeatures::linkServiceWorkerEnabled() || (originTrialContext && originTrialContext->isFeatureEnabled("ForeignFetch"))) {
+            V8HTMLLinkElement::installLinkServiceWorker(scriptState->isolate(), scriptState->world(), v8::Local<v8::Object>(), prototypeObject, interfaceObject);
+        }
+    }
+}
+
+namespace {
+
+InstallConditionalFeaturesFunction s_installConditionalFeaturesFunction = &installConditionalFeaturesCore;
+
+}
+
+InstallConditionalFeaturesFunction setInstallConditionalFeaturesFunction(InstallConditionalFeaturesFunction newInstallConditionalFeaturesFunction)
+{
+    InstallConditionalFeaturesFunction originalFunction = s_installConditionalFeaturesFunction;
+    s_installConditionalFeaturesFunction = newInstallConditionalFeaturesFunction;
+    return originalFunction;
+}
+
+void installConditionalFeatures(const WrapperTypeInfo* type, const ScriptState* scriptState, v8::Local<v8::Object> prototypeObject, v8::Local<v8::Function> interfaceObject)
+{
+    (*s_installConditionalFeaturesFunction)(type, scriptState, prototypeObject, interfaceObject);
+}
+
+} // namespace blink