[promises] port NewPromiseCapability to TF

src/builtins/builtins-promise.h

Index: src/builtins/builtins-promise.h
diff --git a/src/builtins/builtins-promise.h b/src/builtins/builtins-promise.h
index 9a3a106cf222db597cd8be688fad5b7a7f71583e..b6bb5135e803f6fa55dbb619d33fd96bb6bf28ac 100644
--- a/src/builtins/builtins-promise.h
+++ b/src/builtins/builtins-promise.h
@@ -41,11 +41,19 @@ class PromiseBuiltinsAssembler : public CodeStubAssembler {
   void BranchIfFastPath(Node* context, Node* promise, Label* if_isunmodified,
                         Label* if_ismodified);
 
+  Node* CreatePromiseContext(Node* native_context, int slots);

[gsathya, 2016/12/30 02:35:42]

Can you please add tests for this and the others?

[caitp, 2017/01/02 15:51:12]

Added tests for NewPromiseCapability and
CreatePromiseGetCapabilitiesExecutorContext (NewInternalPromiseCapability is
removed in latest patchset, and CreatePromiseContext() is just a helper for the
common code between the 2 promise context types, so it has coverage already).

   Node* CreatePromiseResolvingFunctionsContext(Node* promise, Node* debug_event,
                                                Node* native_context);
 
   std::pair<Node*, Node*> CreatePromiseResolvingFunctions(
       Node* promise, Node* native_context, Node* promise_context);
+
+  Node* CreatePromiseGetCapabilitiesExecutorContext(Node* native_context,
+                                                    Node* promise_capability);
+
+  Node* NewPromiseCapability(Node* context, Node* constructor,
+                             Node* debug_event = nullptr);
+  Node* NewInternalPromiseCapability(Node* context, Node* parent);
 };
 
 }  // namespace internal