[LayoutNG] Add NGText class definition

third_party/WebKit/Source/core/layout/ng/NGText.h

Index: third_party/WebKit/Source/core/layout/ng/NGText.h
diff --git a/third_party/WebKit/Source/core/layout/ng/NGFragment.h b/third_party/WebKit/Source/core/layout/ng/NGText.h
similarity index 74%
copy from third_party/WebKit/Source/core/layout/ng/NGFragment.h
copy to third_party/WebKit/Source/core/layout/ng/NGText.h
index 3aa3bd8ba4ddd652cc79932fc6aa228fd10a915b..44147822ead50e3bff2792e27f515280f8504dc9 100644
--- a/third_party/WebKit/Source/core/layout/ng/NGFragment.h
+++ b/third_party/WebKit/Source/core/layout/ng/NGText.h
@@ -2,18 +2,19 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef NGFragment_h
-#define NGFragment_h
+#ifndef NGText_h
+#define NGText_h
 
 #include "core/CoreExport.h"
 #include "platform/LayoutUnit.h"
+#include "wtf/text/WTFString.h"
 
 namespace blink {
 
-class CORE_EXPORT NGFragment final {
+class CORE_EXPORT NGText final {
 public:
-    NGFragment(LayoutUnit inlineSize, LayoutUnit blockSize);
-    ~NGFragment() { }
+    NGText(LayoutUnit inlineSize, LayoutUnit blockSize);
+    ~NGText() { }
 
     LayoutUnit inlineSize() const { return m_inlineSize; }
     LayoutUnit blockSize() const { return m_blockSize; }
@@ -21,6 +22,8 @@ public:
     LayoutUnit inlineOffset() const { return m_inlineOffset; }
     LayoutUnit blockOffset() const { return m_blockOffset; }
 
+    const String text() const { return String(); }
+
     void setOffset(LayoutUnit inlineOffset, LayoutUnit blockOffset);
 
 private:
@@ -33,4 +36,4 @@ private:
 
 } // namespace blink
 
-#endif // NGFragment_h
+#endif // NGText_h