Make TestingProfile auto-create incognito profiles.

chrome/test/base/testing_profile.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 "chrome/test/base/testing_profile.h"
 
 #include "build/build_config.h"
 
 #include "base/base_paths.h"
 #include "base/command_line.h"
@@ skipping 580 matching lines @@
 }
 
 void TestingProfile::SetOriginalProfile(Profile* profile) {
   DCHECK(IsOffTheRecord());
   original_profile_ = profile;
 }
 
 Profile* TestingProfile::GetOffTheRecordProfile() {
   if (IsOffTheRecord())
     return this;
+  if (!incognito_profile_) {
+    TestingProfile::Builder builder;
+    builder.SetIncognito();
+    scoped_ptr<TestingProfile> incognito_test_profile(builder.Build());
+    incognito_test_profile->SetOriginalProfile(this);
+    SetOffTheRecordProfile(incognito_test_profile.PassAs<Profile>());
+  }
   return incognito_profile_.get();
 }
 
 bool TestingProfile::HasOffTheRecordProfile() {
   return incognito_profile_.get() != NULL;
 }
 
 Profile* TestingProfile::GetOriginalProfile() {
   if (original_profile_)
     return original_profile_;
@@ skipping 335 matching lines @@
       path_,
       delegate_,
       extension_policy_,
       pref_service_.Pass(),
       incognito_,
       guest_session_,
       managed_user_id_,
       policy_service_.Pass(),
       testing_factories_));
 }