Make sure gin Handles exist before using them

content/renderer/skia_benchmarking_extension.cc

 // Copyright (c) 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/skia_benchmarking_extension.h"
 
 #include "base/base64.h"
 #include "base/time/time.h"
 #include "base/values.h"
 #include "cc/base/math_util.h"
@@ skipping 56 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<SkiaBenchmarking> controller =
       gin::CreateHandle(isolate, new SkiaBenchmarking());
+  if (controller.IsEmpty())
+    return;
+
   v8::Handle<v8::Object> global = context->Global();
   v8::Handle<v8::Object> chrome =
       global->Get(gin::StringToV8(isolate, "chrome"))->ToObject();
   if (chrome.IsEmpty()) {
     chrome = v8::Object::New(isolate);
     global->Set(gin::StringToV8(isolate, "chrome"), chrome);
   }
   chrome->Set(gin::StringToV8(isolate, "skiaBenchmarking"), controller.ToV8());
 }
 
@@ skipping 214 matching lines @@
   v8::Handle<v8::Object> result = v8::Object::New(isolate);
   result->Set(v8::String::NewFromUtf8(isolate, "width"),
               v8::Number::New(isolate, picture->LayerRect().width()));
   result->Set(v8::String::NewFromUtf8(isolate, "height"),
               v8::Number::New(isolate, picture->LayerRect().height()));
 
   args->Return(result);
 }
 
 } // namespace content