Introduce TextBuffer as Output Type of copyTextTo() for Text Iterators

third_party/WebKit/Source/core/core.gypi

 {
     'includes': [
         'core_generated.gypi',
     ],
     'variables': {
         # Files for which bindings (.cpp and .h files) will be generated
         'core_idl_files': [
             'animation/KeyframeEffect.idl',
             'animation/EffectModel.idl',
             'animation/AnimationEffectReadOnly.idl',
@@ skipping 1471 matching lines @@
             'editing/commands/UndoStep.h',
             'editing/commands/UnlinkCommand.cpp',
             'editing/commands/UnlinkCommand.h',
             'editing/commands/WrapContentsInDummySpanCommand.cpp',
             'editing/commands/WrapContentsInDummySpanCommand.h',
             'editing/iterators/BackwardsCharacterIterator.cpp',
             'editing/iterators/BitStack.cpp',
             'editing/iterators/FullyClippedStateStack.cpp',
             'editing/iterators/SearchBuffer.cpp',
             'editing/iterators/SearchBuffer.h',
+            'editing/iterators/TextBuffer.cpp',
+            'editing/iterators/TextBuffer.h',
             'editing/iterators/TextIterator.cpp',
             'editing/iterators/TextIterator.h',
             'editing/iterators/TextIteratorTextState.cpp',
             'editing/iterators/TextIteratorTextState.h',
             'editing/iterators/CharacterIterator.cpp',
             'editing/iterators/SimplifiedBackwardsTextIterator.cpp',
             'editing/iterators/WordAwareIterator.cpp',
             'editing/markers/DocumentMarker.cpp',
             'editing/markers/DocumentMarker.h',
             'editing/markers/DocumentMarkerController.cpp',
@@ skipping 2536 matching lines @@
             'style/SVGComputedStyleTest.cpp',
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }