Revert 112815 - [Sync] Make syncer commands avoid posting tasks on threads with no work to do

chrome/browser/sync/engine/model_changing_syncer_command_unittest.cc

-// Copyright (c) 2011 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 "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "chrome/browser/sync/engine/model_changing_syncer_command.h"
-#include "chrome/browser/sync/sessions/sync_session.h"
-#include "chrome/browser/sync/syncable/model_type.h"
-#include "chrome/browser/sync/test/engine/fake_model_worker.h"
-#include "chrome/browser/sync/test/engine/syncer_command_test.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace browser_sync {
-
-namespace {
-
-class FakeModelChangingSyncerCommand : public ModelChangingSyncerCommand {
- public:
-  FakeModelChangingSyncerCommand() {}
-  virtual ~FakeModelChangingSyncerCommand() {}
-
-  const std::set<ModelSafeGroup>& changed_groups() const {
-    return changed_groups_;
-  }
-
- protected:
-  virtual std::set<ModelSafeGroup> GetGroupsToChange(
-      const sessions::SyncSession& session) const {
-    return session.GetEnabledGroups();
-  }
-
-  virtual void ModelChangingExecuteImpl(sessions::SyncSession* session) {
-    changed_groups_.insert(session->status_controller().group_restriction());
-  }
-
- private:
-  std::set<ModelSafeGroup> changed_groups_;
-
-  DISALLOW_COPY_AND_ASSIGN(FakeModelChangingSyncerCommand);
-};
-
-class ModelChangingSyncerCommandTest : public SyncerCommandTest {
- protected:
-  ModelChangingSyncerCommandTest() {}
-  virtual ~ModelChangingSyncerCommandTest() {}
-
-  virtual void SetUp() {
-    workers()->push_back(
-        make_scoped_refptr(new FakeModelWorker(GROUP_UI)));
-    workers()->push_back(
-        make_scoped_refptr(new FakeModelWorker(GROUP_PASSWORD)));
-    (*mutable_routing_info())[syncable::BOOKMARKS] = GROUP_UI;
-    (*mutable_routing_info())[syncable::PASSWORDS] = GROUP_PASSWORD;
-    SyncerCommandTest::SetUp();
-  }
-
-  FakeModelChangingSyncerCommand command_;
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(ModelChangingSyncerCommandTest);
-};
-
-TEST_F(ModelChangingSyncerCommandTest, Basic) {
-  ExpectGroupsToChange(command_, GROUP_UI, GROUP_PASSWORD, GROUP_PASSIVE);
-  EXPECT_TRUE(command_.changed_groups().empty());
-  command_.ExecuteImpl(session());
-  EXPECT_EQ(command_.GetGroupsToChangeForTest(*session()),
-            command_.changed_groups());
-}
-
-}  // namespace
-
-}  // namespace browser_sync