Introduce composed tree version of isEndOfEditableOrNonEditableContent()

This patch introduces composed tree version of
|isEndOfEditableOrNonEditableContent()| by templatizing original
|isEndOfEditableOrNonEditableContent()| 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/1333583002

git-svn-id: svn://svn.chromium.org/blink/trunk@201955 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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

@@ -1613,11 +1613,22 @@ VisiblePosition endOfEditableContent(const VisiblePosition& visiblePosition)
     return createVisiblePosition(lastPositionInNode(highestRoot));
 }
 
-bool isEndOfEditableOrNonEditableContent(const VisiblePosition& p)
+template <typename Strategy>
+static bool isEndOfEditableOrNonEditableContentAlgorithm(const VisiblePositionTemplate<Strategy>& p)
 {
     return p.isNotNull() && nextPositionOf(p).isNull();
 }
 
+bool isEndOfEditableOrNonEditableContent(const VisiblePosition& position)
+{
+    return isEndOfEditableOrNonEditableContentAlgorithm<EditingStrategy>(position);
+}
+
+bool isEndOfEditableOrNonEditableContent(const VisiblePositionInComposedTree& position)
+{
+    return isEndOfEditableOrNonEditableContentAlgorithm<EditingInComposedTreeStrategy>(position);
+}
+
 VisiblePosition leftBoundaryOfLine(const VisiblePosition& c, TextDirection direction)
 {
     return direction == LTR ? logicalStartOfLine(c) : logicalEndOfLine(c);

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

@@ -167,7 +167,8 @@ bool isEndOfDocument(const VisiblePosition&);
 // editable content
 VisiblePosition startOfEditableContent(const VisiblePosition&);
 VisiblePosition endOfEditableContent(const VisiblePosition&);
-bool isEndOfEditableOrNonEditableContent(const VisiblePosition&);
+CORE_EXPORT bool isEndOfEditableOrNonEditableContent(const VisiblePosition&);
+CORE_EXPORT bool isEndOfEditableOrNonEditableContent(const VisiblePositionInComposedTree&);
 
 CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const Position&, TextAffinity);
 CORE_EXPORT InlineBoxPosition computeInlineBoxPosition(const Position&, TextAffinity, TextDirection primaryDirection);

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

@@ -93,6 +93,24 @@ TEST_F(VisibleUnitsTest, endOfParagraph)
     EXPECT_EQ(PositionInComposedTree(two->firstChild(), 2), endOfParagraph(createVisiblePositionInComposedTree(*two->firstChild(), 2)).deepEquivalent());
 }
 
+TEST_F(VisibleUnitsTest, isEndOfEditableOrNonEditableContent)
+{
+    const char* bodyContent = "<a id=host><b id=one contenteditable>1</b><b id=two>22</b></a>";
+    const char* shadowContent = "<content select=#two></content></p><p><content select=#one></content>";
+    setBodyContent(bodyContent);
+    setShadowContent(shadowContent, "host");
+    updateLayoutAndStyleForPainting();
+
+    Element* one = document().getElementById("one");
+    Element* two = document().getElementById("two");
+
+    EXPECT_FALSE(isEndOfEditableOrNonEditableContent(createVisiblePositionInDOMTree(*one->firstChild(), 1)));
+    EXPECT_TRUE(isEndOfEditableOrNonEditableContent(createVisiblePositionInComposedTree(*one->firstChild(), 1)));
+
+    EXPECT_TRUE(isEndOfEditableOrNonEditableContent(createVisiblePositionInDOMTree(*two->firstChild(), 2)));
+    EXPECT_FALSE(isEndOfEditableOrNonEditableContent(createVisiblePositionInComposedTree(*two->firstChild(), 2)));
+}
+
 TEST_F(VisibleUnitsTest, inSameLine)
 {
     const char* bodyContent = "<p id='host'>00<b id='one'>11</b><b id='two'>22</b>33</p>";