[wasm] Table.Grow should grow dispatch tables

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 528 matching lines @@
   }
   new_size64 += old_size;
 
   if (new_size64 < old_size || new_size64 > receiver->maximum_length()) {
     v8::Local<v8::Value> e = v8::Exception::RangeError(
         v8_str(isolate, new_size64 < old_size ? "trying to shrink table"
                                               : "maximum table size exceeded"));
     isolate->ThrowException(e);
     return;
   }
+
   int new_size = static_cast<int>(new_size64);
+  i::WasmTableObject::Grow(i_isolate, receiver,
+                           static_cast<uint32_t>(new_size - old_size));
 
   if (new_size != old_size) {
     i::Handle<i::FixedArray> new_array =
         i_isolate->factory()->NewFixedArray(new_size);
     for (int i = 0; i < old_size; ++i) new_array->set(i, old_array->get(i));
     i::Object* null = i_isolate->heap()->null_value();
     for (int i = old_size; i < new_size; ++i) new_array->set(i, null);
     receiver->set_functions(*new_array);
   }
 
-  // TODO(titzer): update relevant instances.
+  // TODO(gdeepti): use weak links for instances
+  v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
+  return_value.Set(old_size);
 }
 
 void WebAssemblyTableGet(const v8::FunctionCallbackInfo<v8::Value>& args) {
   v8::Isolate* isolate = args.GetIsolate();
   Local<Context> context = isolate->GetCurrentContext();
   i::Handle<i::Context> i_context = Utils::OpenHandle(*context);
   if (!BrandCheck(isolate, Utils::OpenHandle(*args.This()),
                   i::Handle<i::Symbol>(i_context->wasm_table_sym()),
                   "Receiver is not a WebAssembly.Table")) {
     return;
@@ skipping 321 matching lines @@
   i::Handle<i::Symbol> symbol(isolate->context()->wasm_memory_sym(), isolate);
   return HasBrand(value, symbol);
 }
 
 bool WasmJs::IsWasmTableObject(Isolate* isolate, Handle<Object> value) {
   i::Handle<i::Symbol> symbol(isolate->context()->wasm_table_sym(), isolate);
   return HasBrand(value, symbol);
 }
 }  // namespace internal
 }  // namespace v8