Add WebKit API for doing a hit-test that mimics GestureTap

Source/web/tests/WebViewTest.cpp

 /*
  * Copyright (C) 2011, 2012 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 409 matching lines @@
     negativeResult.reset();
 
     // Scale page up 2x so image should occupy the whole viewport.
     webView->setPageScaleFactor(2.0f);
     WebHitTestResult positiveResult = webView->hitTestResultAt(hitPoint);
     ASSERT_EQ(WebNode::ElementNode, positiveResult.node().nodeType());
     EXPECT_TRUE(positiveResult.node().to<WebElement>().hasHTMLTagName("img"));
     positiveResult.reset();
 }
 
+TEST_F(WebViewTest, HitTestResultForTapWithTapArea)
+{
+    std::string url = m_baseURL + "hit_test.html";
+    URLTestHelpers::registerMockedURLLoad(toKURL(url), "hit_test.html");
+    WebView* webView = m_webViewHelper.initializeAndLoad(url, true, 0);
+    webView->resize(WebSize(100, 100));
+    WebPoint hitPoint(55, 55);
+
+    // Image is at top left quandrant, so should not hit it.
+    WebHitTestResult negativeResult = webView->hitTestResultAt(hitPoint);
+    ASSERT_EQ(WebNode::ElementNode, negativeResult.node().nodeType());
+    EXPECT_FALSE(negativeResult.node().to<WebElement>().hasHTMLTagName("img"));
+    negativeResult.reset();
+
+    // The tap area is 20 by 20 square, centered at 55, 55.
+    WebSize tapArea(20, 20);
+    WebHitTestResult positiveResult = webView->hitTestResultForTap(hitPoint, tapArea);
+    ASSERT_EQ(WebNode::ElementNode, positiveResult.node().nodeType());
+    EXPECT_TRUE(positiveResult.node().to<WebElement>().hasHTMLTagName("img"));
+    positiveResult.reset();
+
+    // Scale down page by half so the image is outside the tapped area now.
+    webView->setPageScaleFactor(0.5f);
+    WebHitTestResult negativeResult2 = webView->hitTestResultForTap(hitPoint, tapArea);
+    ASSERT_EQ(WebNode::ElementNode, negativeResult2.node().nodeType());
+    EXPECT_FALSE(negativeResult2.node().to<WebElement>().hasHTMLTagName("img"));
+    negativeResult2.reset();
+}
+
 void WebViewTest::testAutoResize(const WebSize& minAutoResize, const WebSize& maxAutoResize,
                                  const std::string& pageWidth, const std::string& pageHeight,
                                  int expectedWidth, int expectedHeight,
                                  HorizontalScrollbarState expectedHorizontalState, VerticalScrollbarState expectedVerticalState)
 {
     AutoResizeWebViewClient client;
     std::string url = m_baseURL + "specify_size.html?" + pageWidth + ":" + pageHeight;
     URLTestHelpers::registerMockedURLLoad(toKURL(url), "specify_size.html");
     WebView* webView = m_webViewHelper.initializeAndLoad(url, true, 0, &client);
     client.testData().setWebView(webView);
@@ skipping 1776 matching lines @@
     loadFrame(webView->mainFrame(), url);
 
     FrameView* frameView = m_webViewHelper.webViewImpl()->mainFrameImpl()->frameView();
 
     // Auto-resizing used to ASSERT(needsLayout()) in RenderBlockFlow::layout. This EXPECT is
     // merely a dummy. The real test is that we don't trigger asserts in debug builds.
     EXPECT_FALSE(frameView->needsLayout());
 };
 
 } // namespace