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

third_party/WebKit/public/platform/Platform.h

Index: third_party/WebKit/public/platform/Platform.h
diff --git a/third_party/WebKit/public/platform/Platform.h b/third_party/WebKit/public/platform/Platform.h
index ffe7e912d3a6aeb6985fd2bf7b44e0d090b95a79..bf1e8e5ffcf4664c5e57daf35406437eafc12fe4 100644
--- a/third_party/WebKit/public/platform/Platform.h
+++ b/third_party/WebKit/public/platform/Platform.h
@@ -41,6 +41,7 @@
 #include "WebCommon.h"
 #include "WebData.h"
 #include "WebDeviceLightListener.h"
+#include "WebFeaturePolicy.h"
 #include "WebGamepadListener.h"
 #include "WebGamepads.h"
 #include "WebGestureDevice.h"
@@ -668,6 +669,21 @@ class BLINK_PLATFORM_EXPORT Platform {
 
   virtual WebTrialTokenValidator* trialTokenValidator() { return nullptr; }
 
+  // Feature Policy -----------------------------------------------------
+
+  virtual WebFeaturePolicy* createFeaturePolicy(
+      const WebFeaturePolicy* parentPolicy,
+      const WebParsedFeaturePolicyHeader& policyHeader,
+      const WebSecurityOrigin&) {
+    return nullptr;
+  }
+  virtual bool isFeatureEnabledByPolicy(const WebFeaturePolicy*,
+                                        WebFeaturePolicyFeature) {
+    return true;
+  }
+  virtual void updateFeaturePolicyOrigin(WebFeaturePolicy* parentPolicy,
+                                         const WebSecurityOrigin&) {}
+
  protected:
   Platform();
   virtual ~Platform() {}