Use a fresh, temporary profile when running content_shell in DRT mode

content/shell/shell_browser_context.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/shell/shell_browser_context.h"
 
 #include "base/bind.h"
+#include "base/command_line.h"
 #include "base/environment.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/threading/thread.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/shell/shell_download_manager_delegate.h"
 #include "content/shell/shell_resource_context.h"
+#include "content/shell/shell_switches.h"
 #include "content/shell/shell_url_request_context_getter.h"
 
 #if defined(OS_WIN)
 #include "base/base_paths_win.h"
 #elif defined(OS_LINUX)
 #include "base/nix/xdg_util.h"
 #elif defined(OS_MACOSX)
 #include "base/base_paths_mac.h"
 #endif
 
@@ skipping 15 matching lines @@
 }
 
 ShellBrowserContext::~ShellBrowserContext() {
   if (resource_context_.get()) {
     BrowserThread::DeleteSoon(
       BrowserThread::IO, FROM_HERE, resource_context_.release());
   }
 }
 
 void ShellBrowserContext::InitWhileIOAllowed() {
+  if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kDumpRenderTree)) {
+    CHECK(testing_path_.CreateUniqueTempDir());
+    path_ = testing_path_.path();
+    return;
+  }
 #if defined(OS_WIN)
   CHECK(PathService::Get(base::DIR_LOCAL_APP_DATA, &path_));
   path_ = path_.Append(std::wstring(L"content_shell"));
 #elif defined(OS_LINUX)
   scoped_ptr<base::Environment> env(base::Environment::Create());
   FilePath config_dir(base::nix::GetXDGDirectory(env.get(),
                                                  kXdgConfigHomeEnvVar,
                                                  kDotConfigDir));
   path_ = config_dir.Append("content_shell");
 #elif defined(OS_MACOSX)
@@ skipping 64 matching lines @@
 
 bool ShellBrowserContext::DidLastSessionExitCleanly()  {
   return true;
 }
 
 quota::SpecialStoragePolicy* ShellBrowserContext::GetSpecialStoragePolicy() {
   return NULL;
 }
 
 }  // namespace content