Make inSameLine() in VisibleUnits.cpp to work with positions in composed tree

Source/core/editing/VisibleUnitsTest.cpp

Index: Source/core/editing/VisibleUnitsTest.cpp
diff --git a/Source/core/editing/VisibleUnitsTest.cpp b/Source/core/editing/VisibleUnitsTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..e53f20a5f402f4ac42cf9cb83bca4216969248af
--- /dev/null
+++ b/Source/core/editing/VisibleUnitsTest.cpp
@@ -0,0 +1,55 @@
+// 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/VisibleUnits.h"
+
+#include "core/editing/EditingTestBase.h"
+#include "core/editing/VisiblePosition.h"
+
+namespace blink {
+
+namespace {
+
+PositionWithAffinity positionWithAffinityInDOMTree(Node& anchor, int offset, EAffinity affinity = DOWNSTREAM)
+{
+    return PositionWithAffinity(canonicalPositionOf(Position(&anchor, offset, Position::PositionIsOffsetInAnchor)), affinity);
+}
+
+PositionInComposedTreeWithAffinity positionWithAffinityInComposedTree(Node& anchor, int offset, EAffinity affinity = DOWNSTREAM)
+{
+    return PositionInComposedTreeWithAffinity(canonicalPositionOf(PositionInComposedTree(&anchor, offset, PositionInComposedTree::PositionIsOffsetInAnchor)), affinity);
+}
+
+} // namespace
+
+class VisibleUnitsTest : public EditingTestBase {
+};
+
+TEST_F(VisibleUnitsTest, inSameLine)
+{
+    const char* bodyContent = "<p id='host'>00<b id='one'>11</b><b id='two'>22</b>33</p>";
+    const char* shadowContent = "<div><span id='s4'>44</span><content select=#two></content><br><span id='s5'>55</span><br><content select=#one></content><span id='s6'>66</span></div>";
+    setBodyContent(bodyContent);
+    RefPtrWillBeRawPtr<ShadowRoot> shadowRoot = setShadowContent(shadowContent);
+    updateLayoutAndStyleForPainting();
+
+    RefPtrWillBeRawPtr<Element> body = document().body();
+    RefPtrWillBeRawPtr<Element> one = body->querySelector("#one", ASSERT_NO_EXCEPTION);
+    RefPtrWillBeRawPtr<Element> two = body->querySelector("#two", ASSERT_NO_EXCEPTION);
+    RefPtrWillBeRawPtr<Element> four = shadowRoot->querySelector("#s4", ASSERT_NO_EXCEPTION);
+    RefPtrWillBeRawPtr<Element> five = shadowRoot->querySelector("#s5", ASSERT_NO_EXCEPTION);
+
+    EXPECT_TRUE(inSameLine(positionWithAffinityInDOMTree(*one, 0), positionWithAffinityInDOMTree(*two, 0)));
+    EXPECT_TRUE(inSameLine(positionWithAffinityInDOMTree(*one->firstChild(), 0), positionWithAffinityInDOMTree(*two->firstChild(), 0)));
+    EXPECT_FALSE(inSameLine(positionWithAffinityInDOMTree(*one->firstChild(), 0), positionWithAffinityInDOMTree(*five->firstChild(), 0)));
+    EXPECT_FALSE(inSameLine(positionWithAffinityInDOMTree(*two->firstChild(), 0), positionWithAffinityInDOMTree(*four->firstChild(), 0)));
+
+    EXPECT_FALSE(inSameLine(positionWithAffinityInComposedTree(*one, 0), positionWithAffinityInComposedTree(*two, 0)));
+    EXPECT_FALSE(inSameLine(positionWithAffinityInComposedTree(*one->firstChild(), 0), positionWithAffinityInComposedTree(*two->firstChild(), 0)));
+    EXPECT_FALSE(inSameLine(positionWithAffinityInComposedTree(*one->firstChild(), 0), positionWithAffinityInComposedTree(*five->firstChild(), 0)));
+    EXPECT_TRUE(inSameLine(positionWithAffinityInComposedTree(*two->firstChild(), 0), positionWithAffinityInComposedTree(*four->firstChild(), 0)));
+}
+
+} // namespace blink