Implement link selection on alt+mouse drag.

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 57 matching lines @@
 // Same as above, but for WebFrame::loadHistoryItem().
 void loadHistoryItem(WebFrame*, const WebHistoryItem&, WebHistoryLoadType, WebURLRequest::CachePolicy);
 // Same as above, but for WebFrame::reload().
 void reloadFrame(WebFrame*);
 void reloadFrameIgnoringCache(WebFrame*);
 
 // Pumps pending resource requests while waiting for a frame to load. Consider
 // using one of the above helper methods whenever possible.
 void pumpPendingRequestsForFrameToLoad(WebFrame*);
 
+WebMouseEvent createMouseEvent(WebInputEvent::Type, WebMouseEvent::Button, const IntPoint&, int modifiers);
+
 // Calls WebRemoteFrame::createLocalChild, but with some arguments prefilled
 // with default test values (i.e. with a default |client| or |properties| and/or
 // with a precalculated |uniqueName|).
 WebLocalFrame* createLocalChild(WebRemoteFrame* parent, const WebString& name = WebString(), WebFrameClient* = nullptr, WebFrame* previousSibling = nullptr, const WebFrameOwnerProperties& = WebFrameOwnerProperties());
 WebRemoteFrame* createRemoteChild(WebRemoteFrame* parent, WebRemoteFrameClient*, const WebString& name = WebString());
 
 class SettingOverrider {
 public:
     virtual void overrideSettings(WebSettings*) = 0;
 };
@@ skipping 109 matching lines @@
         WebDOMMessageEvent) override { }
 
 private:
     RawPtrWillBePersistent<WebRemoteFrameImpl> const m_frame;
 };
 
 } // namespace FrameTestHelpers
 } // namespace blink
 
 #endif // FrameTestHelpers_h