[wasm] Implement importing of WebAssembly.Memory.

src/wasm/wasm-js.h

Index: src/wasm/wasm-js.h
diff --git a/src/wasm/wasm-js.h b/src/wasm/wasm-js.h
index 4f264946249eaf9a1b603ba3b2c678d364c2b8b9..9970dc92d8da421df06b47460dc742df08acdf6d 100644
--- a/src/wasm/wasm-js.h
+++ b/src/wasm/wasm-js.h
@@ -27,6 +27,11 @@ class WasmJs {
   static Handle<JSObject> CreateWasmMemoryObject(Isolate* isolate,
                                                  Handle<JSArrayBuffer> buffer,
                                                  bool has_maximum, int maximum);
+
+  static bool IsWasmMemoryObject(Isolate* isolate, Handle<Object> value);
+
+  static Handle<JSArrayBuffer> GetWasmMemoryArrayBuffer(Isolate* isolate,
+                                                        Handle<Object> value);
 };
 
 }  // namespace internal