Use V8 Maybe APIs in extensions/renderer

extensions/renderer/app_runtime_custom_bindings.cc

 // Copyright 2014 The Chromium 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 "extensions/renderer/app_runtime_custom_bindings.h"
 
 #include "base/bind.h"
 #include "base/strings/string_number_conversions.h"
+#include "extensions/renderer/v8_maybe_helpers.h"
 #include "third_party/WebKit/public/platform/WebCString.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "third_party/WebKit/public/web/WebBlob.h"
 #include "third_party/WebKit/public/web/WebSerializedScriptValue.h"
 
 using blink::WebBlob;
 using blink::WebSerializedScriptValue;
 using blink::WebString;
 
 namespace {
 
 void DeserializeString(const v8::FunctionCallbackInfo<v8::Value>& args) {
   DCHECK(args.Length() == 1);
   DCHECK(args[0]->IsString());
 
   std::string data_v8(*v8::String::Utf8Value(args[0]));
   WebString data_webstring = WebString::fromUTF8(data_v8);
   WebSerializedScriptValue serialized =
       WebSerializedScriptValue::fromString(data_webstring);
   args.GetReturnValue().Set(serialized.deserialize());
 }
 
 void SerializeToString(const v8::FunctionCallbackInfo<v8::Value>& args) {
   DCHECK(args.Length() == 1);
   WebSerializedScriptValue data = WebSerializedScriptValue::serialize(args[0]);
   WebString data_webstring = data.toString();
 
   std::string v = std::string(data_webstring.utf8());
-  args.GetReturnValue().Set(
-      v8::String::NewFromUtf8(args.GetIsolate(), v.c_str()));
+  if (v.size() >= v8::String::kMaxLength)
+    return;
+  args.GetReturnValue().Set(extensions::ToV8String(args.GetIsolate(),
+                                                   v.c_str()));
 }
 
 void CreateBlob(const v8::FunctionCallbackInfo<v8::Value>& args) {
   DCHECK(args.Length() == 2);
   DCHECK(args[0]->IsString());
   DCHECK(args[1]->IsNumber());
 
   std::string blob_file_path(*v8::String::Utf8Value(args[0]));
   std::string blob_length_string(*v8::String::Utf8Value(args[1]));
   int64 blob_length = 0;
   DCHECK(base::StringToInt64(blob_length_string, &blob_length));
   blink::WebBlob web_blob =
       WebBlob::createFromFile(WebString::fromUTF8(blob_file_path), blob_length);
   args.GetReturnValue().Set(
       web_blob.toV8Value(args.Holder(), args.GetIsolate()));
 }
 
 }  // namespace
 
 namespace extensions {
 
 AppRuntimeCustomBindings::AppRuntimeCustomBindings(ScriptContext* context)
     : ObjectBackedNativeHandler(context) {
   RouteFunction("DeserializeString", base::Bind(&DeserializeString));
   RouteFunction("SerializeToString", base::Bind(&SerializeToString));
   RouteFunction("CreateBlob", base::Bind(&CreateBlob));
 }
 
 }  // namespace extensions