Warm up the crypto subsystem before entering the GPU sandbox.

content/gpu/gpu_main.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 <stdlib.h>
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
 #include "base/environment.h"
 #include "base/message_loop.h"
 #include "base/rand_util.h"
 #include "base/stringprintf.h"
 #include "base/threading/platform_thread.h"
 #include "base/win/scoped_com_initializer.h"
 #include "build/build_config.h"
 #include "content/common/gpu/gpu_config.h"
 #include "content/public/common/content_client.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/common/main_function_params.h"
 #include "content/gpu/gpu_child_thread.h"
 #include "content/gpu/gpu_info_collector.h"
 #include "content/gpu/gpu_process.h"
+#include "crypto/hmac.h"
 #include "ui/gfx/gl/gl_surface.h"
 #include "ui/gfx/gl/gl_switches.h"
 
 #if defined(OS_WIN)
 #include "content/common/gpu/media/dxva_video_decode_accelerator.h"
 #include "sandbox/src/sandbox.h"
 #endif
 
 #if defined(USE_X11)
 #include "ui/base/x/x11_util.h"
@@ skipping 61 matching lines @@
   } else {
     LOG(INFO) << "gfx::GLSurface::InitializeOneOff failed";
     gpu_info.gpu_accessible = false;
     dead_on_arrival = true;
   }
 
   // Warm up the random subsystem, which needs to done pre-sandbox on all
   // platforms.
   (void) base::RandUint64();
 
+  // Warm up the crypto subsystem, which needs to done pre-sandbox on all
+  // platforms.
+  crypto::HMAC hmac(crypto::HMAC::SHA256);
+  unsigned char key = '\0';
+  bool ret = hmac.Init(&key, sizeof(key));
+  (void) ret;
+
 #if defined(OS_LINUX)
   content::InitializeSandbox();
 #endif
 
   base::win::ScopedCOMInitializer com_initializer;
 
 #if defined(OS_WIN)
   // Preload this DLL because the sandbox prevents it from loading.
   LoadLibrary(L"setupapi.dll");
 
@@ skipping 33 matching lines @@
   child_thread->Init(start_time);
 
   gpu_process.set_main_thread(child_thread);
 
   main_message_loop.Run();
 
   child_thread->StopWatchdog();
 
   return 0;
 }