Introduce content-side Feature Policy object and maintain in parallel with renderer policy.

third_party/WebKit/public/platform/WebFeaturePolicy.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 WebFeaturePolicy_h
 #define WebFeaturePolicy_h
 
 #include "WebSecurityOrigin.h"
 #include "WebString.h"
 #include "WebVector.h"
 
 namespace blink {
 
+// These values map to the features which can be controlled by Feature Policy.
+// TODO(iclelland): Link to the spec where the behaviour for each of these is
+// defined.
+enum class WebFeaturePolicyFeature {
+  NotFound = 0,
+  // Controls access to document.cookie attribute.
+  DocumentCookie,
+  // Contols access to document.domain attribute.
+  DocumentDomain,
+  // Controls access to document.write and document.writeln methods.
+  DocumentWrite,
+  // Controls whether Element.requestFullscreen is allowed.
+  Fullscreen,
+  // Controls access to Geolocation interface.
+  Geolocation,
+  // Controls access to requestMIDIAccess method.
+  MidiFeature,
+  // Controls access to Notification interface.
+  Notifications,
+  // Controls access to PaymentRequest interface.
+  Payment,
+  // Controls access to PushManager interface.
+  Push,
+  // Controls whether synchronous script elements will run.
+  SyncScript,
+  // Controls use of synchronous XMLHTTPRequest API.
+  SyncXHR,
+  // Controls access to NavigatorUserMedia interface.
+  Usermedia,
+  // Controls access to navigator.vibrate method.
+  Vibrate,
+  // Controls access to RTCPeerConnection interface.
+  WebRTC,
+  LAST_FEATURE = WebRTC
+};
+
 struct WebParsedFeaturePolicyDeclaration {
   WebParsedFeaturePolicyDeclaration() : matchesAllOrigins(false) {}
   WebString featureName;
   bool matchesAllOrigins;
   WebVector<WebSecurityOrigin> origins;
 };
 
 // Used in Blink code to represent parsed headers. Used for IPC between renderer
 // and browser.
 using WebParsedFeaturePolicyHeader =
     WebVector<WebParsedFeaturePolicyDeclaration>;
 
 }  // namespace blink
 
 #endif  // WebFeaturePolicy_h