Plumbing blink::Interface{Provider|Registry} through WebLocalFrame's constructor.

third_party/WebKit/Source/web/tests/FrameTestHelpers.h

 /*
  * Copyright (C) 2011 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 235 matching lines @@
                                   WebTreeScopeType,
                                   const WebString& name,
                                   const WebString& uniqueName,
                                   WebSandboxFlags,
                                   const WebFrameOwnerProperties&) override;
   void didStartLoading(bool) override;
   void didStopLoading() override;
 
   bool isLoading() { return m_loadsInProgress > 0; }
 
+  // Tests can override the virtual method below to mock the interface provider.
+  virtual blink::InterfaceProvider* interfaceProvider() { return nullptr; }
+
  private:
   int m_loadsInProgress = 0;
 };
 
 // Minimal implementation of WebRemoteFrameClient needed for unit tests that
 // load remote frames. Tests that load frames and need further specialization
 // of WebFrameClient behavior should subclass this.
 class TestWebRemoteFrameClient : public WebRemoteFrameClient {
  public:
   TestWebRemoteFrameClient();
 
   WebRemoteFrameImpl* frame() const { return m_frame; }
 
   // WebRemoteFrameClient overrides:
   void frameDetached(DetachType) override;
   void forwardPostMessage(WebLocalFrame* sourceFrame,
                           WebRemoteFrame* targetFrame,
                           WebSecurityOrigin targetOrigin,
                           WebDOMMessageEvent) override {}
 
  private:
   Persistent<WebRemoteFrameImpl> const m_frame;
 };
 
 }  // namespace FrameTestHelpers
 }  // namespace blink
 
 #endif  // FrameTestHelpers_h