[Prerender] Add a "SimpleLoad" mode to be used as a comparison reference

chrome/browser/prerender/prerender_field_trial.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/prerender/prerender_field_trial.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 12 matching lines @@
 
     if (switch_value == switches::kPrerenderModeSwitchValueDisabled) {
       mode = PrerenderManager::PRERENDER_MODE_DISABLED;
     } else if (switch_value == switches::kPrerenderModeSwitchValuePrefetch) {
       mode = PrerenderManager::PRERENDER_MODE_NOSTATE_PREFETCH;
     } else if (switch_value.empty() ||
                switch_value == switches::kPrerenderModeSwitchValueEnabled) {
       // The empty string means the option was provided with no value, and that
       // means enable.
       mode = PrerenderManager::PRERENDER_MODE_ENABLED;
+    } else if (switch_value == switches::kPrerenderModeSwitchValueSimpleLoad) {
+      mode = PrerenderManager::PRERENDER_MODE_SIMPLE_LOAD_EXPERIMENT;
     } else {
       mode = PrerenderManager::PRERENDER_MODE_DISABLED;
       LOG(ERROR) << "Invalid --prerender option received on command line: "
                  << switch_value;
       LOG(ERROR) << "Disabling prerendering!";
     }
   }
 
   PrerenderManager::SetMode(mode);
 }
@@ skipping 19 matching lines @@
       return false;
 
     DCHECK_EQ(switches::kPrerenderFromOmniboxSwitchValueAuto, switch_value);
   }
 
   return (base::FieldTrialList::FindFullName("PrerenderFromOmnibox") !=
           "OmniboxPrerenderDisabled");
 }
 
 }  // namespace prerender