Introduce PositionInComposedTree version of enclosingBlock()

Source/core/editing/EditingUtilitiesTest.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/editing/EditingUtilities.h"
 
 #include "core/editing/EditingTestBase.h"
 
 namespace blink {
@@ skipping 13 matching lines @@
     Node* three = shadowRoot->getElementById("three");
 
     EXPECT_EQ(Position(one, 0), firstEditablePositionAfterPositionInRoot(Position(one, 0), host));
 
     EXPECT_EQ(PositionInComposedTree(one, 0), firstEditablePositionAfterPositionInRoot(PositionInComposedTree(one, 0), host));
 
     EXPECT_EQ(Position::firstPositionInNode(host), firstEditablePositionAfterPositionInRoot(Position(three, 0), host));
     EXPECT_EQ(PositionInComposedTree::afterNode(host), firstEditablePositionAfterPositionInRoot(PositionInComposedTree(three, 0), host));
 }
 
+TEST_F(EditingUtilitiesTest, enclosingBlock)
+{
+    const char* bodyContent = "<p id='host'><b id='one'>11</b></p>";
+    const char* shadowContent = "<content select=#two></content><div id='three'><content select=#one></content></div>";
+    setBodyContent(bodyContent);
+    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = setShadowContent(shadowContent);
+    updateLayoutAndStyleForPainting();
+    Node* host = document().getElementById("host");
+    Node* one = document().getElementById("one");
+    Node* three = shadowRoot->getElementById("three");
+
+    EXPECT_EQ(host, enclosingBlock(Position(one, 0), CannotCrossEditingBoundary));
+    EXPECT_EQ(three, enclosingBlock(PositionInComposedTree(one, 0), CannotCrossEditingBoundary));
+}
+
 TEST_F(EditingUtilitiesTest, enclosingNodeOfType)
 {
     const char* bodyContent = "<p id='host'><b id='one'>11</b></p>";
     const char* shadowContent = "<content select=#two></content><div id='three'><content select=#one></div></content>";
     setBodyContent(bodyContent);
     RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = setShadowContent(shadowContent);
     updateLayoutAndStyleForPainting();
     Node* host = document().getElementById("host");
     Node* one = document().getElementById("one");
     Node* three = shadowRoot->getElementById("three");
@@ skipping 24 matching lines @@
     updateLayoutAndStyleForPainting();
     Node* one = document().getElementById("one");
     Node* two = document().getElementById("two");
     Node* three = document().getElementById("three");
 
     EXPECT_EQ(Position(two->firstChild(), 1), nextVisuallyDistinctCandidate(Position(one, 1)));
     EXPECT_EQ(PositionInComposedTree(three->firstChild(), 1), nextVisuallyDistinctCandidate(PositionInComposedTree(one, 1)));
 }
 
 } // namespace blink