Implement MouseEvent buttons attribute.

Source/web/tests/WebFrameTest.cpp

 /*
  * Copyright (C) 2010 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 5480 matching lines @@
     registerMockedHttpURLLoad("fragment_middle_click.html");
     TestNavigationPolicyWebFrameClient client;
     FrameTestHelpers::WebViewHelper webViewHelper;
     webViewHelper.initializeAndLoad(m_baseURL + "fragment_middle_click.html", true, &client);
 
     Document* document = toLocalFrame(webViewHelper.webViewImpl()->page()->mainFrame())->document();
     KURL destination = document->url();
     destination.setFragmentIdentifier("test");
 
     RefPtrWillBeRawPtr<Event> event = MouseEvent::create(EventTypeNames::click, false, false,
-        document->domWindow(), 0, 0, 0, 0, 0, 0, 0, false, false, false, false, 1, nullptr, nullptr);
+        document->domWindow(), 0, 0, 0, 0, 0, 0, 0, false, false, false, false, 1, 0, nullptr, nullptr);
     FrameLoadRequest frameRequest(document, ResourceRequest(destination));
     frameRequest.setTriggeringEvent(event);
     toLocalFrame(webViewHelper.webViewImpl()->page()->mainFrame())->loader().load(frameRequest);
 }
 
 class TestNewWindowWebViewClient : public FrameTestHelpers::TestWebViewClient {
 public:
     virtual WebView* createView(WebLocalFrame*, const WebURLRequest&, const WebWindowFeatures&,
         const WebString&, WebNavigationPolicy, bool) override
     {
@@ skipping 28 matching lines @@
     TestNewWindowWebViewClient webViewClient;
     TestNewWindowWebFrameClient webFrameClient;
     FrameTestHelpers::WebViewHelper webViewHelper;
     webViewHelper.initializeAndLoad(m_baseURL + "ctrl_click.html", true, &webFrameClient, &webViewClient);
 
     Document* document = toLocalFrame(webViewHelper.webViewImpl()->page()->mainFrame())->document();
     KURL destination = toKURL(m_baseURL + "hello_world.html");
 
     // ctrl+click event
     RefPtrWillBeRawPtr<Event> event = MouseEvent::create(EventTypeNames::click, false, false,
-        document->domWindow(), 0, 0, 0, 0, 0, 0, 0, true, false, false, false, 0, nullptr, nullptr);
+        document->domWindow(), 0, 0, 0, 0, 0, 0, 0, true, false, false, false, 0, 0, nullptr, nullptr);
     FrameLoadRequest frameRequest(document, ResourceRequest(destination));
     frameRequest.setTriggeringEvent(event);
     UserGestureIndicator gesture(DefinitelyProcessingUserGesture);
     toLocalFrame(webViewHelper.webViewImpl()->page()->mainFrame())->loader().load(frameRequest);
     FrameTestHelpers::pumpPendingRequestsDoNotUse(webViewHelper.webView()->mainFrame());
 
     // decidePolicyForNavigation should be called both for the original request and the ctrl+click.
     EXPECT_EQ(2, webFrameClient.decidePolicyCallCount());
 }
 
@@ skipping 1355 matching lines @@
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 
     // Neither should a page reload.
     localFrame->reload();
     EXPECT_EQ(4u, frameClient.provisionalLoadCount());
     EXPECT_FALSE(frameClient.wasLastProvisionalLoadATransition());
     EXPECT_EQ(1u, frameClient.navigationalDataReceivedCount());
 }
 
 } // namespace