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

third_party/WebKit/public/web/WebFrame.h

Index: third_party/WebKit/public/web/WebFrame.h
diff --git a/third_party/WebKit/public/web/WebFrame.h b/third_party/WebKit/public/web/WebFrame.h
index 121067b357c1273235e7b42cb559f7c136458313..33d7a80e9715dc2e72d5babd53f1d967872206d0 100644
--- a/third_party/WebKit/public/web/WebFrame.h
+++ b/third_party/WebKit/public/web/WebFrame.h
@@ -556,6 +556,15 @@ public:
     // the given element is not a frame, iframe or if the frame is empty.
     BLINK_EXPORT static WebFrame* fromFrameOwnerElement(const WebElement&);
 
+    // Use WebDocument::isSecureContext() instead of this function to
+    // check whether a context is secure.
+    //
+    // Returns whether it's possible for a descendant of this frame to be a
+    // secure context, not considering scheme exceptions (since any
+    // descendant can be a secure context if it has a scheme exception).
+    // See Document::isSecureContextImpl for more details.
+    BLINK_EXPORT bool canHaveSecureChild() const;
+
 #if BLINK_IMPLEMENTATION
     static WebFrame* fromFrame(Frame*);