[wasm] GrowMemory should update imported memory objects.

src/wasm/wasm-js.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api-natives.h"
 #include "src/api.h"
 #include "src/asmjs/asm-js.h"
 #include "src/asmjs/asm-typer.h"
 #include "src/asmjs/asm-wasm-builder.h"
 #include "src/assert-scope.h"
@@ skipping 938 matching lines @@
 }
 
 Handle<JSArrayBuffer> WasmJs::GetWasmMemoryArrayBuffer(Isolate* isolate,
                                                        Handle<Object> value) {
   DCHECK(IsWasmMemoryObject(isolate, value));
   Handle<Object> buf(
       JSObject::cast(*value)->GetInternalField(kWasmMemoryBuffer), isolate);
   return Handle<JSArrayBuffer>::cast(buf);
 }
 
+void WasmJs::SetWasmMemoryArrayBuffer(Isolate* isolate, Handle<Object> value,
+                                      Handle<JSArrayBuffer> buffer) {
+  DCHECK(IsWasmMemoryObject(isolate, value));
+  JSObject::cast(*value)->SetInternalField(kWasmMemoryBuffer, *buffer);
+}
+
 uint32_t WasmJs::GetWasmMemoryMaximumSize(Isolate* isolate,
                                           Handle<Object> value) {
   DCHECK(IsWasmMemoryObject(isolate, value));
   Object* max_mem =
       JSObject::cast(*value)->GetInternalField(kWasmMemoryMaximum);
   if (max_mem->IsUndefined(isolate)) return wasm::WasmModule::kMaxMemPages;
   uint32_t max_pages = Smi::cast(max_mem)->value();
   return max_pages;
 }
 
 void WasmJs::SetWasmMemoryInstance(Isolate* isolate,
                                    Handle<Object> memory_object,
                                    Handle<JSObject> instance) {
   if (!memory_object->IsUndefined(isolate)) {
     DCHECK(IsWasmMemoryObject(isolate, memory_object));
     // TODO(gdeepti): This should be a weak list of instance objects
     // for instances that share memory.
     JSObject::cast(*memory_object)
         ->SetInternalField(kWasmMemoryInstanceObject, *instance);
   }
 }
 }  // namespace internal
 }  // namespace v8