Construct a field trial to see if HIGH or MEDIUM memory model "works better"...

chrome/browser/browser_process_impl.cc

Index: chrome/browser/browser_process_impl.cc
===================================================================
--- chrome/browser/browser_process_impl.cc	(revision 3603)
+++ chrome/browser/browser_process_impl.cc	(working copy)
@@ -5,9 +5,10 @@
 #include "chrome/browser/browser_process_impl.h"
 
 #include "base/command_line.h"
+#include "base/path_service.h"
 #include "base/thread.h"
-#include "base/path_service.h"
 #include "chrome/browser/automation/automation_provider_list.h"
+#include "chrome/browser/browser_trial.h"
 #include "chrome/browser/chrome_thread.h"
 #include "chrome/browser/download/download_file.h"
 #include "chrome/browser/download/save_file_manager.h"
@@ -115,6 +116,16 @@
       else if (model == L"medium")
         memory_model_ = MEDIUM_MEMORY_MODEL;
     }
+  } else {
+    // Randomly choose what memory model to use.
+    const double probability = 0.5;
+    FieldTrial* trial(new FieldTrial(BrowserTrial::kMemoryModelFieldTrial,
+                                     probability));
+    DCHECK(FieldTrialList::Find(BrowserTrial::kMemoryModelFieldTrial) == trial);
+    if (trial->boolean_value())
+      memory_model_ = HIGH_MEMORY_MODEL;
+    else
+      memory_model_ = MEDIUM_MEMORY_MODEL;
   }
 
   suspend_controller_ = new SuspendController();