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 2cd733425ef79bd2439da87fd20289c818d43e03..9b20ac06bada87bb651c29bc058b0d7df0cc5518 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"
@@ -682,6 +683,28 @@ class BLINK_PLATFORM_EXPORT Platform {
   // depending on memory pressure.
   virtual void requestPurgeMemory() {}
 
+  // Feature Policy -----------------------------------------------------
+
+  // Create a new feature policy object for a document, given its parent
+  // document's policy (may be nullptr), its container policy (may be empty),
+  // the header policy with which it was delivered (may be empty), and the
+  // document's origin.
+  virtual WebFeaturePolicy* createFeaturePolicy(
+      const WebFeaturePolicy* parentPolicy,
+      const WebParsedFeaturePolicyHeader& containerPolicy,
+      const WebParsedFeaturePolicyHeader& policyHeader,
+      const WebSecurityOrigin&) {
+    return nullptr;
+  }
+
+  // Create a new feature policy for a document whose origin has changed, given
+  // the previous policy object and the new origin.
+  virtual WebFeaturePolicy* duplicateFeaturePolicyWithOrigin(
+      const WebFeaturePolicy&,
+      const WebSecurityOrigin&) {
+    return nullptr;
+  }
+
  protected:
   Platform();
   virtual ~Platform() {}