[All-In-One] Introduce BackspaceStateMachine

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 1415 matching lines @@
             'css/resolver/StyleResolver.h',
             'css/resolver/StyleResolverState.cpp',
             'css/resolver/StyleResolverState.h',
             'css/resolver/StyleResolverStats.cpp',
             'css/resolver/StyleResolverStats.h',
             'css/resolver/StyleSharingDepthScope.h',
             'css/resolver/TransformBuilder.cpp',
             'css/resolver/TransformBuilder.h',
             'css/resolver/ViewportStyleResolver.cpp',
             'css/resolver/ViewportStyleResolver.h',
+            'editing/BackspaceStateMachine.cpp',
+            'editing/BackspaceStateMachine.h',
             'editing/CaretBase.cpp',
             'editing/CaretBase.h',
             'editing/CompositionUnderline.h',
             'editing/DOMSelection.cpp',
             'editing/DOMSelection.h',
             'editing/DragCaretController.cpp',
             'editing/DragCaretController.h',
             'editing/EditingBehavior.cpp',
             'editing/EditingBehavior.h',
             'editing/EditingStrategy.cpp',
@@ skipping 2490 matching lines @@
             'dom/RangeTest.cpp',
             'dom/ScriptRunnerTest.cpp',
             'dom/SelectorQueryTest.cpp',
             'dom/StyleElementTest.cpp',
             'dom/StyleEngineTest.cpp',
             'dom/TextTest.cpp',
             'dom/TreeScopeStyleSheetCollectionTest.cpp',
             'dom/TreeScopeTest.cpp',
             'dom/URLSearchParamsTest.cpp',
             'dom/shadow/FlatTreeTraversalTest.cpp',
+            'editing/BackspaceStateMachineTest.cpp',
             'editing/EditingStrategyTest.cpp',
             'editing/EditingTestBase.cpp',
             'editing/EditingTestBase.h',
             'editing/EditingUtilitiesTest.cpp',
             'editing/FrameSelectionTest.cpp',
             'editing/GranularityStrategyTest.cpp',
             'editing/InputMethodControllerTest.cpp',
             'editing/iterators/BackwardsTextBufferTest.cpp',
             'editing/iterators/CharacterIteratorTest.cpp',
             'editing/iterators/ForwardsTextBufferTest.cpp',
@@ skipping 120 matching lines @@
             'svg/SVGPathParserTest.cpp',
             'svg/UnsafeSVGAttributeSanitizationTest.cpp',
             'testing/PrivateScriptTestTest.cpp',
             'timing/MemoryInfoTest.cpp',
             'workers/WorkerThreadTest.cpp',
             'workers/WorkerThreadTestHelper.h',
             'xml/parser/SharedBufferReaderTest.cpp',
         ],
     }
 }