Refactor extension event distribution to use Values instead of JSON strings.

chrome/browser/speech/extension_api/tts_extension_api_controller.cc

 // Copyright (c) 2012 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 "chrome/browser/speech/extension_api/tts_extension_api_controller.h"
 
 #include <string>
 #include <vector>
 
 #include "base/float_util.h"
@@ skipping 90 matching lines @@
   }
   if (desired_event_types_.size() > 0 &&
       desired_event_types_.find(event_type_string) ==
       desired_event_types_.end()) {
     return;
   }
 
   if (src_id_ < 0)
     return;
 
-  ListValue args;
   DictionaryValue* event = new DictionaryValue();
   if (char_index != kInvalidCharIndex)
     event->SetInteger(constants::kCharIndexKey, char_index);
   event->SetString(constants::kEventTypeKey, event_type_string);
   if (event_type == TTS_EVENT_ERROR) {
     event->SetString(constants::kErrorMessageKey, error_message);
   }
   event->SetInteger(constants::kSrcIdKey, src_id_);
   event->SetBoolean(constants::kIsFinalEventKey, finished_);
-  args.Set(0, event);
-  std::string json_args;
-  base::JSONWriter::Write(&args, &json_args);
+
+  ListValue* arguments = new ListValue();
+  arguments->Set(0, event);
 
   profile_->GetExtensionEventRouter()->DispatchEventToExtension(
       src_extension_id_,
       events::kOnEvent,
-      json_args,
+      arguments,
       profile_,
       src_url_);
 }
 
 void Utterance::Finish() {
   finished_ = true;
 }
 
 void Utterance::set_options(const Value* options) {
   options_.reset(options->DeepCopy());
@@ skipping 188 matching lines @@
 
 int ExtensionTtsController::QueueSize() {
   return static_cast<int>(utterance_queue_.size());
 }
 
 ExtensionTtsPlatformImpl* ExtensionTtsController::GetPlatformImpl() {
   if (!platform_impl_)
     platform_impl_ = ExtensionTtsPlatformImpl::GetInstance();
   return platform_impl_;
 }