Ensure that we consistently check contains: paint for fixed position containment.

third_party/WebKit/Source/web/tests/LayoutGeometryMapTest.cpp

 /*
  * Copyright (C) 2014 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 211 matching lines @@
     EXPECT_EQ(FloatQuad(FloatRect(21.0f, 20.0f, 15.0f, 25.0f)), rgm.mapToAncestor(rect, getLayoutContainer(webView, "CenterDiv")));
 
     rect = FloatRect(22.0f, 15.2f, 15.3f, 0.0f);
     EXPECT_EQ(FloatQuad(FloatRect(43.0f, 35.2f, 15.3f, 0.0f)), rgm.mapToAncestor(rect, getLayoutContainer(webView, "CenterDiv")));
 
     EXPECT_EQ(FloatQuad(FloatRect(43.0f, 35.2f, 15.3f, 0.0f)), rgm.mapToAncestor(rect, getLayoutContainer(webView, "InnerDiv")));
 
     EXPECT_EQ(FloatQuad(FloatRect(43.0f, 35.2f, 15.3f, 0.0f)), rgm.mapToAncestor(rect, nullptr));
 }
 
+TEST_F(LayoutGeometryMapTest, ContainsFixedPositionTest)
+{
+    registerMockedHttpURLLoad("rgm_contains_fixed_position_test.html");
+    FrameTestHelpers::WebViewHelper webViewHelper;
+    WebView* webView = webViewHelper.initializeAndLoad(m_baseURL + "rgm_contains_fixed_position_test.html", true, 0, 0);
+    webView->resize(WebSize(1000, 1000));
+    webView->updateAllLifecyclePhases();
+
+    FloatRect rect(0.0f, 0.0f, 100.0f, 100.0f);
+    LayoutGeometryMap rgm;
+
+    // This fixed position element is not contained and so is attached at the top of the viewport.
+    rgm.pushMappingsToAncestor(getLayoutBox(webView, "simple-container"), 0);
+    EXPECT_EQ(FloatQuad(FloatRect(8.0f, 100.0f, 100.0f, 100.0f)), rgm.mapToAncestor(rect, nullptr));
+    rgm.pushMappingsToAncestor(getLayoutBox(webView, "fixed1"), getLayoutBox(webView, "simple-container"));
+    EXPECT_EQ(FloatQuad(FloatRect(8.0f, 50.0f, 100.0f, 100.0f)), rgm.mapToAncestor(rect, nullptr));
+    rgm.popMappingsToAncestor(static_cast<PaintLayer*>(nullptr));
+
+    // Transforms contain fixed position descendants.
+    rgm.pushMappingsToAncestor(getLayoutBox(webView, "has-transform"), 0);
+    EXPECT_EQ(FloatQuad(FloatRect(8.0f, 100.0f, 100.0f, 100.0f)), rgm.mapToAncestor(rect, nullptr));
+    rgm.pushMappingsToAncestor(getLayoutBox(webView, "fixed2"), getLayoutBox(webView, "has-transform"));
+    EXPECT_EQ(FloatQuad(FloatRect(8.0f, 100.0f, 100.0f, 100.0f)), rgm.mapToAncestor(rect, nullptr));
+    rgm.popMappingsToAncestor(static_cast<PaintLayer*>(nullptr));
+
+    // Paint containment contains fixed position descendants.
+    rgm.pushMappingsToAncestor(getLayoutBox(webView, "contains-paint"), 0);
+    EXPECT_EQ(FloatQuad(FloatRect(8.0f, 100.0f, 100.0f, 100.0f)), rgm.mapToAncestor(rect, nullptr));
+    rgm.pushMappingsToAncestor(getLayoutBox(webView, "fixed3"), getLayoutBox(webView, "contains-paint"));
+    EXPECT_EQ(FloatQuad(FloatRect(8.0f, 100.0f, 100.0f, 100.0f)), rgm.mapToAncestor(rect, nullptr));
+    rgm.popMappingsToAncestor(static_cast<PaintLayer*>(nullptr));
+}
+
 TEST_F(LayoutGeometryMapTest, IframeTest)
 {
     registerMockedHttpURLLoad("rgm_iframe_test.html");
     registerMockedHttpURLLoad("rgm_test.html");
     FrameTestHelpers::WebViewHelper webViewHelper;
     WebView* webView = webViewHelper.initializeAndLoad(m_baseURL + "rgm_iframe_test.html", true, 0, 0);
     webView->resize(WebSize(1000, 1000));
     webView->updateAllLifecyclePhases();
 
     LayoutGeometryMap rgm(TraverseDocumentBoundaries);
@@ skipping 90 matching lines @@
     rgm.popMappingsToAncestor(static_cast<PaintLayer*>(nullptr));
     rgm.pushMappingsToAncestor(getLayoutBox(webView, "Col3"), nullptr);
     EXPECT_NEAR(8.0f + offset * 2.0f, rectFromQuad(rgm.mapToAncestor(rect, nullptr)).x(), 0.1f);
     EXPECT_NEAR(8.0f, rectFromQuad(rgm.mapToAncestor(rect, nullptr)).y(), 0.1f);
     EXPECT_EQ(5.0f, rectFromQuad(rgm.mapToAncestor(rect, nullptr)).width());
     EXPECT_EQ(3.0f, rectFromQuad(rgm.mapToAncestor(rect, nullptr)).height());
 
 }
 
 } // namespace blink