Use a valid /prefetch argument when launching a process.

content/browser/renderer_host/render_process_host_impl.cc

 // Copyright 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.
 
 // Represents the browser side of the browser <--> renderer communication
 // channel. There will be one RenderProcessHost per renderer process.
 
 #include "content/browser/renderer_host/render_process_host_impl.h"
 
 #include <algorithm>
@@ skipping 175 matching lines @@
 #include "content/browser/screen_orientation/screen_orientation_message_filter_android.h"
 #include "ipc/ipc_sync_channel.h"
 #endif
 
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
 #include "base/win/windows_version.h"
 #include "content/browser/renderer_host/dwrite_font_proxy_message_filter_win.h"
 #include "content/common/font_cache_dispatcher_win.h"
 #include "content/common/sandbox_win.h"
+#include "content/public/common/prefetch_argument_win.h"
 #include "sandbox/win/src/sandbox_policy.h"
 #include "ui/gfx/win/dpi.h"
 #endif
 
 #if defined(OS_MACOSX) && !defined(OS_IOS)
 #include "content/browser/bootstrap_sandbox_manager_mac.h"
 #include "content/browser/mach_broker_mac.h"
 #endif
 
 #if defined(USE_OZONE)
@@ skipping 1078 matching lines @@
   DCHECK(gpu_data_manager);
   gpu_data_manager->AppendRendererCommandLine(command_line);
 }
 
 void RenderProcessHostImpl::AppendRendererCommandLine(
     base::CommandLine* command_line) const {
   // Pass the process type first, so it shows first in process listings.
   command_line->AppendSwitchASCII(switches::kProcessType,
                                   switches::kRendererProcess);
 
+#if defined(OS_WIN)
+  AddWindowsPrefetchArgument(PREFETCH_ID_RENDERER, command_line);
+#endif  // defined(OS_WIN)
+
   // Now send any options from our own command line we want to propagate.
   const base::CommandLine& browser_command_line =
       *base::CommandLine::ForCurrentProcess();
   PropagateBrowserCommandLineToRenderer(browser_command_line, command_line);
 
   // Pass on the browser locale.
   const std::string locale =
       GetContentClient()->browser()->GetApplicationLocale();
   command_line->AppendSwitchASCII(switches::kLang, locale);
 
@@ skipping 1459 matching lines @@
 void RenderProcessHostImpl::GetAudioOutputControllers(
     const GetAudioOutputControllersCallback& callback) const {
   audio_renderer_host()->GetOutputControllers(callback);
 }
 
 BluetoothDispatcherHost* RenderProcessHostImpl::GetBluetoothDispatcherHost() {
   return bluetooth_dispatcher_host_.get();
 }
 
 }  // namespace content