[ABANDONED] Implement ThenableCoercions for AP2 Promises

Source/bindings/bindings.gypi

 {
     'variables': {
         'bindings_dir': ['.'],
         'bindings_files': [
             'v8/ActiveDOMCallback.cpp',
             'v8/ActiveDOMCallback.h',
             'v8/ArrayValue.cpp',
             'v8/ArrayValue.h',
             'v8/BindingSecurity.cpp',
             'v8/BindingSecurity.h',
@@ skipping 62 matching lines @@
             'v8/ScriptState.cpp',
             'v8/ScriptState.h',
             'v8/ScriptString.cpp',
             'v8/ScriptString.h',
             'v8/ScriptValue.cpp',
             'v8/ScriptValue.h',
             'v8/ScriptWrappable.h',
             'v8/SerializedScriptValue.cpp',
             'v8/SerializedScriptValue.h',
             'v8/SharedPersistent.h',
+            'v8/ThenableCoercions.cpp',
+            'v8/ThenableCoercions.h',
             'v8/UnsafePersistent.h',
             'v8/V8AbstractEventListener.cpp',
             'v8/V8AbstractEventListener.h',
             'v8/V8Binding.cpp',
             'v8/V8Binding.h',
             'v8/V8BindingMacros.h',
             'v8/V8Callback.cpp',
             'v8/V8Callback.h',
             'v8/V8CustomElementLifecycleCallbacks.cpp',
             'v8/V8CustomElementLifecycleCallbacks.h',
@@ skipping 154 matching lines @@
             'v8/custom/V8WorkerCustom.cpp',
             'v8/custom/V8XMLHttpRequestCustom.cpp',
             'v8/custom/V8XSLTProcessorCustom.cpp',
             'v8/npruntime.cpp',
             'v8/npruntime_impl.h',
             'v8/npruntime_priv.h',
         ],
         'bindings_unittest_files': [
             'v8/IDBBindingUtilitiesTest.cpp',
             'v8/ScriptPromiseResolverTest.cpp',
+            'v8/ThenableCoercionsTest.cpp',
         ],
         'conditions': [
             ['OS=="win" and buildtype=="Official"', {
                 # On windows official release builds, we try to preserve symbol space.
                 'derived_sources_aggregate_files': [
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSourcesAll.cpp',
                 ],
             },{
                 'derived_sources_aggregate_files': [
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources01.cpp',
@@ skipping 13 matching lines @@
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources15.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources16.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources17.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources18.cpp',
                     '<(SHARED_INTERMEDIATE_DIR)/blink/bindings/V8DerivedSources19.cpp',
                 ],
             }],
         ],
     },
 }