[FeaturePolicy] Initial implementation of Feature Policy

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/ScriptController.h"
+#include "bindings/core/v8/ScriptState.h"
+#include "bindings/core/v8/WindowProxy.h"
+#include "bindings/core/v8/WorkerOrWorkletScriptController.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExecutionContext.h"
+#include "core/frame/LocalFrame.h"
+#include "core/workers/WorkerGlobalScope.h"
+#include "platform/feature_policy/FeaturePolicy.h"
+#include "wtf/text/WTFString.h"
+
+namespace blink {
+
+void initializeConditionalFeatures(ExecutionContext* context)
+{
+    if (context->isDocument()) {
+        LocalFrame* frame = toDocument(context)->frame();
+        if (!frame)
+            return;
+        ScriptState* state = ScriptState::forMainWorld(frame);
+        if (!state)
+            return;
+        if (!frame->script().windowProxy(state->world())->isContextInitialized())
+            return;
+        v8::HandleScope handleScope(state->isolate());
+        installOriginTrials(state);
+    } else if (context->isWorkerGlobalScope()) {
+        WorkerOrWorkletScriptController* scriptController = toWorkerGlobalScope(context)->scriptController();
+        if (!scriptController)
+            return;
+        ScriptState* state = scriptController->getScriptState();
+        if (!state)
+            return;
+        if (!scriptController->isContextInitialized())
+            return;
+        v8::HandleScope handleScope(state->isolate());
+        installOriginTrials(state);
+    }
+}
+
+bool isFeatureEnabledInFrame(const FeaturePolicyFeature* feature, const Frame* frame)
+{
+    if (!frame)
+        return FeaturePolicy::isFeatureEnabledByDefault(feature, true);
+    FeaturePolicy* featurePolicy = frame->getFeaturePolicy();
+    if (!featurePolicy)
+        return FeaturePolicy::isFeatureEnabledByDefault(feature, frame->isMainFrame());
+    return featurePolicy->isFeatureEnabledForOrigin(feature, frame->securityContext()->getSecurityOrigin());
+}
+
+} // namespace