Fix integration tests in src/chrome and src/extensions so that we can turn on IO thread checks wi...

chrome/browser/policy/cloud/cloud_policy_browsertest.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 <memory>
 
 #include "base/callback.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/memory/ptr_util.h"
 #include "base/numerics/safe_conversions.h"
 #include "base/path_service.h"
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
+#include "base/threading/thread_restrictions.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/invalidation/profile_invalidation_provider_factory.h"
 #include "chrome/browser/policy/cloud/cloud_policy_test_utils.h"
 #include "chrome/browser/policy/profile_policy_connector.h"
 #include "chrome/browser/policy/profile_policy_connector_factory.h"
 #include "chrome/browser/policy/test/local_policy_test_server.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 248 matching lines @@
   }
 
   invalidation::FakeInvalidationService* GetInvalidationService() {
     return static_cast<invalidation::FakeInvalidationService*>(
         static_cast<invalidation::ProfileInvalidationProvider*>(
             invalidation::ProfileInvalidationProviderFactory::GetInstance()->
                 GetForProfile(browser()->profile()))->GetInvalidationService());
   }
 
   void SetServerPolicy(const std::string& policy) {
+    base::ThreadRestrictions::ScopedAllowIO allow_io;
     int result = base::WriteFile(policy_file_path(), policy.data(),
                                  policy.size());
     ASSERT_EQ(base::checked_cast<int>(policy.size()), result);
   }
 
   base::FilePath policy_file_path() const {
     return temp_dir_.GetPath().AppendASCII("policy.json");
   }
 
   void OnPolicyUpdated(const PolicyNamespace& ns,
@@ skipping 196 matching lines @@
 
   // They should now serialize to the same bytes.
   std::string chrome_settings_serialized;
   std::string cloud_policy_serialized;
   ASSERT_TRUE(chrome_settings.SerializeToString(&chrome_settings_serialized));
   ASSERT_TRUE(cloud_policy.SerializeToString(&cloud_policy_serialized));
   EXPECT_EQ(chrome_settings_serialized, cloud_policy_serialized);
 }
 
 }  // namespace policy