Temporarily CHECK(trial) in ChromeRenderProcessObserver::OnSetFieldTrialGroup.

chrome/renderer/chrome_render_process_observer.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/renderer/chrome_render_process_observer.h"
 
 #include <limits>
 #include <vector>
 
 #include "base/allocator/allocator_extension.h"
@@ skipping 374 matching lines @@
   if (webkit_initialized_)
     WebCache::getResourceTypeStats(&stats);
   RenderThread::Get()->Send(new ChromeViewHostMsg_ResourceTypeStats(stats));
 }
 
 void ChromeRenderProcessObserver::OnSetFieldTrialGroup(
     const std::string& field_trial_name,
     const std::string& group_name) {
   base::FieldTrial* trial =
       base::FieldTrialList::CreateFieldTrial(field_trial_name, group_name);
+  // TODO(mef): Remove this check after the investigation of 359406 is complete.
+  CHECK(trial) << field_trial_name << ":" << group_name;
   // Ensure the trial is marked as "used" by calling group() on it. This is
   // needed to ensure the trial is properly reported in renderer crash reports.
   trial->group();
   chrome_variations::SetChildProcessLoggingVariationList();
 }
 
 void ChromeRenderProcessObserver::OnGetV8HeapStats() {
   HeapStatisticsCollector::Instance()->InitiateCollection();
 }
 
 void ChromeRenderProcessObserver::ExecutePendingClearCache() {
   if (clear_cache_pending_ && webkit_initialized_) {
     clear_cache_pending_ = false;
     WebCache::clear();
   }
 }
 
 const RendererContentSettingRules*
 ChromeRenderProcessObserver::content_setting_rules() const {
   return &content_setting_rules_;
 }