Replicate feature policy container policies.

third_party/WebKit/Source/core/frame/FrameOwner.h

Index: third_party/WebKit/Source/core/frame/FrameOwner.h
diff --git a/third_party/WebKit/Source/core/frame/FrameOwner.h b/third_party/WebKit/Source/core/frame/FrameOwner.h
index ededeaa03d4436223fba31924bce73e97764cc20..f6f1a5a43bd4264397cdbddc17f3e892a1e4bc68 100644
--- a/third_party/WebKit/Source/core/frame/FrameOwner.h
+++ b/third_party/WebKit/Source/core/frame/FrameOwner.h
@@ -51,6 +51,7 @@ class CORE_EXPORT FrameOwner : public GarbageCollectedMixin {
   virtual bool IsDisplayNone() const = 0;
   virtual AtomicString Csp() const = 0;
   virtual const WebVector<WebFeaturePolicyFeature>& AllowedFeatures() const = 0;
+  virtual const WebParsedFeaturePolicy& ContainerPolicy() const = 0;
 };
 
 // TODO(dcheng): This class is an internal implementation detail of provisional
@@ -88,6 +89,10 @@ class CORE_EXPORT DummyFrameOwner
     DEFINE_STATIC_LOCAL(WebVector<WebFeaturePolicyFeature>, features, ());
     return features;
   }
+  const WebParsedFeaturePolicy& ContainerPolicy() const override {
+    DEFINE_STATIC_LOCAL(WebParsedFeaturePolicy, container_policy, ());
+    return container_policy;

[dcheng, 2017/04/18 16:26:37]

Nit: it's unclear to me why we need a static local for this; we expect this to
be called basically only for tests. I would just return WebParsedFeaturePolicy()
and not bother with the static local.

(Ditto for 89-90, but it's OK to leave that for now, since that's not changed by
this CL)

[iclelland, 2017/04/18 19:19:44]

It needs to return a reference (the other non-test implementations return a
reference to the real policy), and so can't just use a temporary. I could add an
actual member var, with basically the same effect, but I thought that following
the existing pattern made sense.

+  }
 
  private:
   // Intentionally private to prevent redundant checks when the type is