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

third_party/WebKit/public/platform/WebFeaturePolicy.h

Index: third_party/WebKit/public/platform/WebFeaturePolicy.h
diff --git a/third_party/WebKit/public/platform/WebFeaturePolicy.h b/third_party/WebKit/public/platform/WebFeaturePolicy.h
index b0394a552ad220cfd2c2f08f38566d8787d29180..5b8bdfb1f800fa29abd3846567dcaa32383d6111 100644
--- a/third_party/WebKit/public/platform/WebFeaturePolicy.h
+++ b/third_party/WebKit/public/platform/WebFeaturePolicy.h
@@ -11,6 +11,42 @@
 
 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;