Make sure gin Handles exist before using them

content/renderer/stats_collection_controller.cc

 // Copyright 2013 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 "content/renderer/stats_collection_controller.h"
 
 #include "base/json/json_writer.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/statistics_recorder.h"
 #include "base/strings/string_util.h"
@@ skipping 69 matching lines @@
   v8::Isolate* isolate = blink::mainThreadIsolate();
   v8::HandleScope handle_scope(isolate);
   v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
   if (context.IsEmpty())
     return;
 
   v8::Context::Scope context_scope(context);
 
   gin::Handle<StatsCollectionController> controller =
       gin::CreateHandle(isolate, new StatsCollectionController());
+  if (controller.IsEmpty())
+    return;
   v8::Handle<v8::Object> global = context->Global();
   global->Set(gin::StringToV8(isolate, "statsCollectionController"),
               controller.ToV8());
 }
 
 StatsCollectionController::StatsCollectionController() {}
 
 StatsCollectionController::~StatsCollectionController() {}
 
 gin::ObjectTemplateBuilder StatsCollectionController::GetObjectTemplateBuilder(
@@ skipping 48 matching lines @@
   }
 
   std::string tab_timing_json;
   ConvertLoadTimeToJSON(
       observer->load_start_time(), observer->load_stop_time(),
       &tab_timing_json);
   return tab_timing_json;
 }
 
 }  // namespace content