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

content/child/blink_platform_impl.h

Index: content/child/blink_platform_impl.h
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index 1716e228a8e1ea1cd44b603b779b2bcc7cf616a9..26c5ca8cc3dcbec844589f08595ec75163023e61 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -122,6 +122,15 @@ class CONTENT_EXPORT BlinkPlatformImpl
   // destructed.
   void SetCompositorThread(blink::scheduler::WebThreadBase* compositor_thread);
 
+  blink::WebFeaturePolicy* createFeaturePolicy(
+      const blink::WebFeaturePolicy* parentPolicy,
+      const blink::WebParsedFeaturePolicyHeader& policyHeader,
+      const blink::WebSecurityOrigin& origin) override;
+  bool isFeatureEnabledByPolicy(const blink::WebFeaturePolicy*,
+                                blink::WebFeaturePolicyFeature) override;
+  void updateFeaturePolicyOrigin(blink::WebFeaturePolicy*,
+                                 const blink::WebSecurityOrigin&) override;
+
  private:
   void InternalInit();
   void WaitUntilWebThreadTLSUpdate(blink::scheduler::WebThreadBase* thread);