[ABANDONED] Implement ThenableCoercions for AP2 Promises

Source/bindings/bindings.gypi

Index: Source/bindings/bindings.gypi
diff --git a/Source/bindings/bindings.gypi b/Source/bindings/bindings.gypi
index 68308c53695a652992b40b3fdb918e43ca5e5796..689fac5d606c7ea949d5fff35de3982fe91b40bd 100644
--- a/Source/bindings/bindings.gypi
+++ b/Source/bindings/bindings.gypi
@@ -80,6 +80,8 @@
             'v8/SerializedScriptValue.cpp',
             'v8/SerializedScriptValue.h',
             'v8/SharedPersistent.h',
+            'v8/ThenableCoercions.cpp',
+            'v8/ThenableCoercions.h',
             'v8/UnsafePersistent.h',
             'v8/V8AbstractEventListener.cpp',
             'v8/V8AbstractEventListener.h',
@@ -254,6 +256,7 @@
         'bindings_unittest_files': [
             'v8/IDBBindingUtilitiesTest.cpp',
             'v8/ScriptPromiseResolverTest.cpp',
+            'v8/ThenableCoercionsTest.cpp',
         ],
         'conditions': [
             ['OS=="win" and buildtype=="Official"', {