Make toPositionInFlatTree() to handle a position anchored by shadow root

third_party/WebKit/Source/core/editing/PositionTest.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 "core/editing/Position.h"
 
 #include "core/editing/EditingTestBase.h"
 
 namespace blink {
 
@@ skipping 121 matching lines @@
 TEST_F(PositionTest, ToPositionInFlatTreeWithShadowRoot)
 {
     const char* bodyContent = "<p id='host'>00<b id='one'>11</b>22</p>";
     const char* shadowContent = "<a><content select=#one></content></a>";
     setBodyContent(bodyContent);
     ShadowRoot* shadowRoot = setShadowContent(shadowContent, "host");
     Element* host = document().getElementById("host");
 
     EXPECT_EQ(PositionInFlatTree(host, 0), toPositionInFlatTree(Position(shadowRoot, 0)));
     EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::AfterChildren), toPositionInFlatTree(Position(shadowRoot, 1)));
+    EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::AfterChildren),
+        toPositionInFlatTree(Position(shadowRoot, PositionAnchorType::AfterChildren)));
+    EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::BeforeChildren),
+        toPositionInFlatTree(Position(shadowRoot, PositionAnchorType::BeforeChildren)));
+    EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::AfterAnchor),
+        toPositionInFlatTree(Position(shadowRoot, PositionAnchorType::AfterAnchor)));
+    EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::BeforeAnchor),
+        toPositionInFlatTree(Position(shadowRoot, PositionAnchorType::BeforeAnchor)));
 }
 
 TEST_F(PositionTest, ToPositionInFlatTreeWithShadowRootContainingSingleContent)
 {
     const char* bodyContent = "<p id='host'>00<b id='one'>11</b>22</p>";
     const char* shadowContent = "<content select=#one></content>";
     setBodyContent(bodyContent);
     ShadowRoot* shadowRoot = setShadowContent(shadowContent, "host");
     Element* host = document().getElementById("host");
 
     EXPECT_EQ(PositionInFlatTree(host, 0), toPositionInFlatTree(Position(shadowRoot, 0)));
     EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::AfterChildren), toPositionInFlatTree(Position(shadowRoot, 1)));
 }
 
 TEST_F(PositionTest, ToPositionInFlatTreeWithEmptyShadowRoot)
 {
     const char* bodyContent = "<p id='host'>00<b id='one'>11</b>22</p>";
     const char* shadowContent = "";
     setBodyContent(bodyContent);
     ShadowRoot* shadowRoot = setShadowContent(shadowContent, "host");
     Element* host = document().getElementById("host");
 
     EXPECT_EQ(PositionInFlatTree(host, PositionAnchorType::AfterChildren), toPositionInFlatTree(Position(shadowRoot, 0)));
 }
 
 } // namespace blink