Fix LayoutObject::mapToVisibleRectInContainerSpace()

third_party/WebKit/Source/core/layout/LayoutObjectTest.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "core/layout/LayoutObject.h"
 
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 89 matching lines @@
     LayoutObject* layoutObject = bodyLayoutObject->slowFirstChild()->slowFirstChild();
 
     // Sanity check: Make sure we don't generate anonymous objects.
     EXPECT_EQ(nullptr, bodyLayoutObject->slowFirstChild()->nextSibling());
     EXPECT_EQ(nullptr, layoutObject->slowFirstChild());
     EXPECT_EQ(nullptr, layoutObject->nextSibling());
 
     EXPECT_EQ(layoutObject->containingBlock(), bodyLayoutObject);
 }
 
+TEST_F(LayoutObjectTest, MapToVisibleRectInContainerSpace)
+{
+    setBodyInnerHTML(
+        "<div id='container' style='overflow: scroll; will-change: transform; width: 50px; height: 50px'>"
+        "  <span><img style='width: 20px; height: 100px'></span>"
+        "  text text text text text text text"
+        "</div>");
+    LayoutBlock* container = toLayoutBlock(document().getElementById("container")->layoutObject());
+    LayoutText* text = toLayoutText(container->lastChild());
+
+    container->setScrollTop(50);
+    LayoutRect rect(0, 60, 20, 20);
+    text->mapToVisibleRectInContainerSpace(container, rect, nullptr);
+    EXPECT_TRUE(rect == LayoutRect(0, 10, 20, 20));
+}
+
 }