Add a finch experiment for different memory pressure management strategies in ChromeOS.

content/browser/browser_main_loop.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 "content/browser/browser_main_loop.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 470 matching lines @@
   }
 #endif
 
   // Create a MessageLoop if one does not already exist for the current thread.
   if (!base::MessageLoop::current())
     main_message_loop_.reset(new base::MessageLoopForUI);
 
   InitializeMainThread();
 
 #if defined(OS_CHROMEOS)
-  if (!base::CommandLine::ForCurrentProcess()->HasSwitch(
-          chromeos::switches::kDisableMemoryPressureSystemChromeOS)) {
+  if (chromeos::switches::MemoryPressureHandlingEnabled()) {
     memory_pressure_observer_.reset(new base::MemoryPressureObserverChromeOS(
         chromeos::switches::GetMemoryPressureThresholds()));
   }
 #endif
 
   {
     TRACE_EVENT0("startup", "BrowserMainLoop::Subsystem:SystemMonitor");
     system_monitor_.reset(new base::SystemMonitor);
   }
   {
@@ skipping 768 matching lines @@
 
 void BrowserMainLoop::EndStartupTracing() {
   is_tracing_startup_ = false;
   TracingController::GetInstance()->DisableRecording(
       TracingController::CreateFileSink(
           startup_trace_file_,
           base::Bind(OnStoppedStartupTracing, startup_trace_file_)));
 }
 
 }  // namespace content