mac: Periodically shim new malloc zones immediately after startup.

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 <stddef.h>
 
 #include <string>
 #include <utility>
@@ skipping 117 matching lines @@
 #include "content/browser/android/tracing_controller_android.h"
 #include "content/browser/media/android/browser_media_player_manager.h"
 #include "content/browser/screen_orientation/screen_orientation_delegate_android.h"
 #include "media/base/android/media_drm_bridge_client.h"
 #include "ui/android/screen_android.h"
 #include "ui/display/screen.h"
 #include "ui/gl/gl_surface.h"
 #endif
 
 #if defined(OS_MACOSX)
+#include "base/allocator/allocator_interception_mac.h"
 #include "base/memory/memory_pressure_monitor_mac.h"
 #include "content/browser/bootstrap_sandbox_manager_mac.h"
 #include "content/browser/cocoa/system_hotkey_helper_mac.h"
 #include "content/browser/mach_broker_mac.h"
 #include "content/browser/renderer_host/browser_compositor_view_mac.h"
 #include "content/browser/theme_helper_mac.h"
 #include "ui/accelerated_widget_mac/window_resize_helper_mac.h"
 #endif
 
 #if defined(USE_OZONE)
@@ skipping 705 matching lines @@
   // the second time.
   base::FeatureList::InitializeInstance(
       command_line->GetSwitchValueASCII(switches::kEnableFeatures),
       command_line->GetSwitchValueASCII(switches::kDisableFeatures));
 
   InitializeMemoryManagementComponent();
 
   if (base::FeatureList::IsEnabled(features::kMemoryCoordinator))
     MemoryCoordinatorImpl::GetInstance()->Start();
 
+#if defined(OS_MACOSX)
+  if (CommandLine::InitializedForCurrentProcess() &&

[Mark Mentovai, 2017/04/03 12:10:23]

Untested code. Sad compiler.

+      CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableHeapProfiling)) {
+    base::allocator::PeriodicallyShimNewMallocZones();
+  }
+#endif
+
 #if BUILDFLAG(ENABLE_PLUGINS)
   // Prior to any processing happening on the IO thread, we create the
   // plugin service as it is predominantly used from the IO thread,
   // but must be created on the main thread. The service ctor is
   // inexpensive and does not invoke the io_thread() accessor.
   {
     TRACE_EVENT0("startup", "BrowserMainLoop::CreateThreads:PluginService");
     PluginService::GetInstance()->Init();
   }
 #endif
@@ skipping 900 matching lines @@
         BrowserThread::GetTaskRunnerForThread(BrowserThread::FILE),
         MediaInternals::GetInstance());
   }
   CHECK(audio_manager_);
 
   audio_system_ = media::AudioSystemImpl::Create(audio_manager_.get());
   CHECK(audio_system_);
 }
 
 }  // namespace content