[LayoutNG] Introduce NGPhysicalFragment and make NGFragment a 'view'

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/AnimationEffectReadOnly.idl',
             'animation/AnimationEffectTiming.idl',
@@ skipping 535 matching lines @@
             'layout/ng/layout_ng_block_flow.cc',
             'layout/ng/layout_ng_block_flow.h',
             'layout/ng/ng_block_layout_algorithm.cc',
             'layout/ng/ng_block_layout_algorithm.h',
             'layout/ng/ng_box.cc',
             'layout/ng/ng_box.h',
             'layout/ng/ng_constraint_space.cc',
             'layout/ng/ng_constraint_space.h',
             'layout/ng/ng_derived_constraint_space.cc',
             'layout/ng/ng_derived_constraint_space.h',
+            'layout/ng/ng_direction.cc',
+            'layout/ng/ng_direction.h',
             'layout/ng/ng_physical_constraint_space.cc',
             'layout/ng/ng_physical_constraint_space.h',
+            'layout/ng/ng_physical_fragment.h',
+            'layout/ng/ng_physical_fragment_base.cc',
+            'layout/ng/ng_physical_fragment_base.h',
+            'layout/ng/ng_physical_text_fragment.h',
             'layout/ng/ng_fragment_base.cc',
             'layout/ng/ng_fragment_base.h',
             'layout/ng/ng_fragment_builder.cc',
             'layout/ng/ng_fragment_builder.h',
             'layout/ng/ng_fragment.cc',
             'layout/ng/ng_fragment.h',
             'layout/ng/ng_layout_input_text.h',
             'layout/ng/ng_length_utils.cc',
             'layout/ng/ng_length_utils.h',
             'layout/ng/ng_margin_strut.h',
             'layout/ng/ng_text_fragment.cc',
             'layout/ng/ng_text_fragment.h',
+            'layout/ng/ng_units.cc',
             'layout/ng/ng_units.h',
             'layout/ng/ng_writing_mode.cc',
             'layout/ng/ng_writing_mode.h',
             'layout/BidiRun.h',
             'layout/BidiRunForLine.cpp',
             'layout/BidiRunForLine.h',
             'layout/ClipRect.cpp',
             'layout/ClipRect.h',
             'layout/ClipRects.h',
             'layout/ClipRectsCache.h',
@@ skipping 3448 matching lines @@
             'testing/TypeConversions.h',
             'testing/UnionTypesTest.cpp',
             'testing/UnionTypesTest.h',
             'testing/v8/WebCoreTestSupport.cpp',
             'testing/v8/WebCoreTestSupport.h',
             'testing/WorkerInternals.cpp',
             'testing/WorkerInternals.h',
         ],
     }
 }