Introduce composed tree version of endOfDocument()

This patch introduces composed tree version of |endOfDocument()| by
templatizing original |endOfDocument()| to work both DOM tree position and
composed tree position version for introducing composed tree version of
|VisibleSelection| class.

This patch is a preparation of making selection to handle granularity for web
component, http://crrev.com/1277863002

BUG=513568
TEST=n/a; no behavior changes

Review URL: https://codereview.chromium.org/1326683006

git-svn-id: svn://svn.chromium.org/blink/trunk@201958 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/editing/VisibleUnits.cpp

@@ -1569,18 +1569,25 @@ VisiblePosition startOfDocument(const VisiblePosition& c)
     return startOfDocument(c.deepEquivalent().anchorNode());
 }
 
-VisiblePosition endOfDocument(const Node* node)
+template <typename Strategy>
+static VisiblePositionTemplate<Strategy> endOfDocumentAlgorithm(const VisiblePositionTemplate<Strategy>& visiblePosition)
 {
+    Node* node = visiblePosition.deepEquivalent().anchorNode();
     if (!node || !node->document().documentElement())
-        return VisiblePosition();
+        return VisiblePositionTemplate<Strategy>();
 
     Element* doc = node->document().documentElement();
-    return createVisiblePosition(lastPositionInNode(doc));
+    return createVisiblePosition(PositionAlgorithm<Strategy>::lastPositionInNode(doc));
 }
 
 VisiblePosition endOfDocument(const VisiblePosition& c)
 {
-    return endOfDocument(c.deepEquivalent().anchorNode());
+    return endOfDocumentAlgorithm<EditingStrategy>(c);
+}
+
+VisiblePositionInComposedTree endOfDocument(const VisiblePositionInComposedTree& c)
+{
+    return endOfDocumentAlgorithm<EditingInComposedTreeStrategy>(c);
 }
 
 bool isStartOfDocument(const VisiblePosition& p)

third_party/WebKit/Source/core/editing/VisibleUnits.h

@@ -158,9 +158,9 @@ bool isEndOfBlock(const VisiblePosition&);
 
 // document
 VisiblePosition startOfDocument(const Node*);
-VisiblePosition endOfDocument(const Node*);
 VisiblePosition startOfDocument(const VisiblePosition&);
-VisiblePosition endOfDocument(const VisiblePosition&);
+CORE_EXPORT VisiblePosition endOfDocument(const VisiblePosition&);
+CORE_EXPORT VisiblePositionInComposedTree endOfDocument(const VisiblePositionInComposedTree&);
 bool isStartOfDocument(const VisiblePosition&);
 bool isEndOfDocument(const VisiblePosition&);
 

third_party/WebKit/Source/core/editing/VisibleUnitsTest.cpp

@@ -74,6 +74,24 @@ TEST_F(VisibleUnitsTest, characterAfter)
     EXPECT_EQ('1', characterAfter(createVisiblePositionInComposedTree(*two->firstChild(), 2)));
 }
 
+TEST_F(VisibleUnitsTest, endOfDocument)
+{
+    const char* bodyContent = "<a id=host><b id=one>1</b><b id=two>22</b></a>";
+    const char* shadowContent = "<p><content select=#two></content></p><p><content select=#one></content></p>";
+    setBodyContent(bodyContent);
+    setShadowContent(shadowContent, "host");
+    updateLayoutAndStyleForPainting();
+
+    Element* one = document().getElementById("one");
+    Element* two = document().getElementById("two");
+
+    EXPECT_EQ(Position(two->firstChild(), 2), endOfDocument(createVisiblePositionInDOMTree(*one->firstChild(), 0)).deepEquivalent());
+    EXPECT_EQ(PositionInComposedTree(one->firstChild(), 1), endOfDocument(createVisiblePositionInComposedTree(*one->firstChild(), 0)).deepEquivalent());
+
+    EXPECT_EQ(Position(two->firstChild(), 2), endOfDocument(createVisiblePositionInDOMTree(*two->firstChild(), 1)).deepEquivalent());
+    EXPECT_EQ(PositionInComposedTree(one->firstChild(), 1), endOfDocument(createVisiblePositionInComposedTree(*two->firstChild(), 1)).deepEquivalent());
+}
+
 TEST_F(VisibleUnitsTest, endOfParagraph)
 {
     const char* bodyContent = "<a id=host><b id=one>1</b><b id=two>22</b></a><b id=three>333</b>";