[FeaturePolicy] Initial implementation of Feature Policy

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

 // 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.
 
 #ifndef ConditionalFeatures_h
 #define ConditionalFeatures_h
 
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "core/CoreExport.h"
+#include "platform/feature_policy/FeaturePolicy.h"
 #include <v8.h>
 
 namespace blink {
 
 class ScriptState;
+class LocalFrame;
 
 using InstallConditionalFeaturesFunction = void (*)(const WrapperTypeInfo*,
                                                     const ScriptState*,
                                                     v8::Local<v8::Object>,
                                                     v8::Local<v8::Function>);
 
 // Installs all of the conditionally enabled V8 bindings for the given type, in
 // a specific context. This is called in V8PerContextData, after the constructor
 // and prototype for the type have been created. It indirectly calls the
 // function set by |setInstallConditionalFeaturesFunction|.
 CORE_EXPORT void installConditionalFeatures(const WrapperTypeInfo*,
                                             const ScriptState*,
                                             v8::Local<v8::Object>,
                                             v8::Local<v8::Function>);
 
 // Sets the function to be called by |installConditionalFeatures|. The function
 // is initially set to the private |installConditionalFeaturesCore| function,
 // but can be overridden by this function. A pointer to the previously set
 // function is returned, so that functions can be chained.
 CORE_EXPORT InstallConditionalFeaturesFunction
     setInstallConditionalFeaturesFunction(InstallConditionalFeaturesFunction);
 
+bool isFeatureEnabledInFrame(const FeaturePolicy::Feature*, const LocalFrame*);
+
 }  // namespace blink
 
 #endif  // ConditionalFeatures_h