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

chrome/browser/extensions/api/idle/idle_api.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/extensions/api/idle/idle_api.h"
 
 #include <algorithm>
 #include <map>
 #include <string>
 
@@ skipping 126 matching lines @@
   if (timeout < kMinThreshold) return kMinThreshold;
   if (timeout > kMaxThreshold) return kMaxThreshold;
   return timeout;
 }
 
 }  // namespace
 
 void ExtensionIdleEventRouter::OnIdleStateChange(Profile* profile,
                                                  IdleState state) {
   // Prepare the single argument of the current state.
-  ListValue args;
-  args.Append(CreateIdleValue(state));
-  std::string json_args;
-  base::JSONWriter::Write(&args, &json_args);
+  scoped_ptr<ListValue> args(new ListValue());
+  args->Append(CreateIdleValue(state));
 
   profile->GetExtensionEventRouter()->DispatchEventToRenderers(
-      keys::kOnStateChanged, json_args, profile,
+      keys::kOnStateChanged, args.Pass(), profile,
       GURL(), extensions::EventFilteringInfo());
 }
 
 bool ExtensionIdleQueryStateFunction::RunImpl() {
   int threshold;
   EXTENSION_FUNCTION_VALIDATE(args_->GetInteger(0, &threshold));
   threshold = CheckThresholdBounds(threshold);
 
   IdleState state = ExtensionIdleCache::CalculateIdleState(threshold);
   if (state != IDLE_STATE_UNKNOWN) {
@@ skipping 104 matching lines @@
   }
 }
 
 int ExtensionIdleCache::get_min_threshold() {
   return kMinThreshold;
 }
 
 double ExtensionIdleCache::get_throttle_interval() {
   return static_cast<double>(kThrottleInterval);
 }