Reland: service worker: Don't control a subframe of an insecure context

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

Index: third_party/WebKit/Source/core/frame/Frame.h
diff --git a/third_party/WebKit/Source/core/frame/Frame.h b/third_party/WebKit/Source/core/frame/Frame.h
index 423e8824724299e26da638564f437a9c5d755cea..698e71af8f16cbe6eee3427baa2ba1bdcc977de5 100644
--- a/third_party/WebKit/Source/core/frame/Frame.h
+++ b/third_party/WebKit/Source/core/frame/Frame.h
@@ -136,6 +136,15 @@ public:
 
     virtual void didChangeVisibilityState();
 
+    // Use Document::isSecureContext() instead of this function to
+    // check whether this frame's document is a secure context.
+    //
+    // Returns whether it's possible for a document whose frame is a descendant
+    // of this frame to be a secure context, not considering scheme exceptions
+    // (since any document can be a secure context if it has a scheme
+    // exception). See Document::isSecureContextImpl for more details.
+    bool canHaveSecureChild() const;
+
 protected:
     Frame(FrameClient*, FrameHost*, FrameOwner*);