Merge 138173

Source/WebKit/chromium/tests/PrerenderingTest.cpp

 /*
  * Copyright (C) 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 419 matching lines @@
     EXPECT_EQ(1u, prerenderingSupport()->addCount(webPrerender));
     EXPECT_EQ(1u, prerenderingSupport()->totalCount());
 
     navigateAway();
     close();
 
     // This test passes if this next line doesn't crash.
     webPrerender.didStartPrerender();
 }
 
+TEST_F(PrerenderingTest, FastRemoveElement)
+{
+    initialize("http://www.foo.com/", "prerender/single_prerender.html");
+
+    WebPrerender webPrerender = prerendererClient()->releaseWebPrerender();
+    EXPECT_FALSE(webPrerender.isNull());
+
+    EXPECT_EQ(1u, prerenderingSupport()->addCount(webPrerender));
+    EXPECT_EQ(1u, prerenderingSupport()->totalCount());
+
+    // Race removing & starting the prerender against each other, as if the element was removed very quickly.
+    executeScript("removePrerender()");
+    EXPECT_FALSE(webPrerender.isNull());
+    webPrerender.didStartPrerender();
+
+    // The page should be totally disconnected from the Prerender at this point, so the console should not have updated.
+    EXPECT_EQ(0u, consoleLength());
+}
+
 } // namespace