Make content::FeaturePolicy implement WebFeaturePolicy, and use it in blink code

third_party/WebKit/Source/core/dom/Fullscreen.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 32 matching lines @@
 #include "core/html/HTMLIFrameElement.h"
 #include "core/input/EventHandler.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/layout/LayoutBlockFlow.h"
 #include "core/layout/LayoutFullScreen.h"
 #include "core/layout/api/LayoutFullScreenItem.h"
 #include "core/page/ChromeClient.h"
 #include "core/svg/SVGSVGElement.h"
 #include "platform/ScopedOrientationChangeIndicator.h"
 #include "platform/UserGestureIndicator.h"
+#include "public/platform/Platform.h"
 
 namespace blink {
 
 namespace {
 
 // https://html.spec.whatwg.org/multipage/embedded-content.html#allowed-to-use
 bool allowedToUseFullscreen(const Frame* frame) {
   // To determine whether a Document object |document| is allowed to use the
   // feature indicated by attribute name |allowattribute|, run these steps:
 
@@ skipping 16 matching lines @@
 
     // 4. Return false.
     return false;
   }
 
   // If Feature Policy is enabled, then we need this hack to support it, until
   // we have proper support for <iframe allowfullscreen> in FP:
 
   // 1. If FP, by itself, enables fullscreen in this document, then fullscreen
   // is allowed.
-  if (frame->securityContext()->getFeaturePolicy()->isFeatureEnabled(
-          kFullscreenFeature)) {
+  if (isFeatureEnabledInFrame(WebFeaturePolicyFeature::Fullscreen, frame)) {
     return true;
   }
 
   // 2. Otherwise, if the embedding frame's document is allowed to use
   // fullscreen (either through FP or otherwise), and either:
   //   a) this is a same-origin embedded document, or
   //   b) this document's iframe has the allowfullscreen attribute set,
   // then fullscreen is allowed.
   if (!frame->isMainFrame()) {
     if (allowedToUseFullscreen(frame->tree().parent())) {
@@ skipping 766 matching lines @@
 DEFINE_TRACE(Fullscreen) {
   visitor->trace(m_pendingFullscreenElement);
   visitor->trace(m_fullscreenElementStack);
   visitor->trace(m_currentFullScreenElement);
   visitor->trace(m_eventQueue);
   Supplement<Document>::trace(visitor);
   ContextLifecycleObserver::trace(visitor);
 }
 
 }  // namespace blink