Fix for crash when attaching a frame in WebUI renderer.

content/renderer/memory_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/memory_benchmarking_extension.h"
 
 #include "content/common/memory_benchmark_messages.h"
+#include "content/renderer/chrome_object_extensions_utils.h"
 #include "content/renderer/render_thread_impl.h"
 #include "gin/arguments.h"
 #include "gin/handle.h"
 #include "gin/object_template_builder.h"
 #include "third_party/WebKit/public/web/WebFrame.h"
 #include "third_party/WebKit/public/web/WebKit.h"
 
 #if defined(USE_TCMALLOC) && (defined(OS_LINUX) || defined(OS_ANDROID))
 #include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 #endif
@@ skipping 10 matching lines @@
   v8::Handle<v8::Context> context = frame->mainWorldScriptContext();
   if (context.IsEmpty())
     return;
 
   v8::Context::Scope context_scope(context);
   gin::Handle<MemoryBenchmarkingExtension> controller =
       gin::CreateHandle(isolate, new MemoryBenchmarkingExtension());
   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);
-  }
+  v8::Handle<v8::Object> chrome = GetOrCreateChromeObject(isolate,
+                                                          context->Global());
   chrome->Set(gin::StringToV8(isolate, "memoryBenchmarking"),
               controller.ToV8());
 }
 
 MemoryBenchmarkingExtension::MemoryBenchmarkingExtension() {}
 
 MemoryBenchmarkingExtension::~MemoryBenchmarkingExtension() {}
 
 gin::ObjectTemplateBuilder
 MemoryBenchmarkingExtension::GetObjectTemplateBuilder(v8::Isolate* isolate) {
@@ skipping 27 matching lines @@
   if (process_type == "browser") {
     content::RenderThreadImpl::current()->Send(
         new MemoryBenchmarkHostMsg_HeapProfilerDump(reason));
   } else {
     ::HeapProfilerDump(reason.c_str());
   }
 #endif
 }
 
 }  // namespace content