Add WebLocalFrame::effectiveSandboxFlags()

public/web/WebLocalFrame.h

Index: public/web/WebLocalFrame.h
diff --git a/public/web/WebLocalFrame.h b/public/web/WebLocalFrame.h
index fdd33cc72136906fdd9ce35ec3d5a11eea2b931d..a3e5c72949cf79b1d416eb4a6f6ecb0d2cdcef0d 100644
--- a/public/web/WebLocalFrame.h
+++ b/public/web/WebLocalFrame.h
@@ -159,6 +159,11 @@ public:
     // Registers a test interface factory. Takes ownership of the factory.
     virtual void registerTestInterface(const WebString& name, WebTestInterfaceFactory*) = 0;
 
+    // Iframe sandbox ---------------------------------------------------------
+
+    // Returns the effective sandbox flags which are inherited from their parent frame.
+    virtual WebSandboxFlags effectiveSandboxFlags() const = 0;
+
 protected:
     explicit WebLocalFrame(WebTreeScopeType scope) : WebFrame(scope) { }
 };
@@ -166,4 +171,3 @@ protected:
 } // namespace blink
 
 #endif // WebLocalFrame_h
-