Moves ash content specific tests into ash_content_unittests

ash/test/ash_test_environment_default.cc

+// Copyright 2016 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 "ash/test/ash_test_environment.h"
+
+#include "ash/test/ash_test_views_delegate.h"
+#include "base/memory/ptr_util.h"
+#include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
+#include "base/threading/sequenced_worker_pool.h"
+
+namespace ash {
+namespace test {
+namespace {
+
+class AshTestEnvironmentDefault : public AshTestEnvironment {
+ public:
+  AshTestEnvironmentDefault() {}
+
+  ~AshTestEnvironmentDefault() override {
+    base::RunLoop().RunUntilIdle();
+    if (blocking_pool_) {
+      blocking_pool_->FlushForTesting();
+      blocking_pool_->Shutdown();
+      blocking_pool_ = nullptr;
+    }
+    base::RunLoop().RunUntilIdle();
+  }
+
+  // AshTestEnvironment:
+  base::SequencedWorkerPool* GetBlockingPool() override {
+    if (!blocking_pool_) {
+      blocking_pool_ = new base::SequencedWorkerPool(
+          3, "AshBlocking", base::TaskPriority::USER_VISIBLE);

[James Cook, 2016/08/31 16:20:16]

nit: put 3 in a named constant or comment what it is

[sky, 2016/08/31 17:35:57]

Done.

+    }
+    return blocking_pool_.get();
+  }
+  std::unique_ptr<views::ViewsDelegate> CreateViewsDelegate() override {
+    return base::MakeUnique<AshTestViewsDelegate>();
+  }
+
+ private:
+  base::MessageLoopForUI message_loop_;
+  scoped_refptr<base::SequencedWorkerPool> blocking_pool_;
+
+  DISALLOW_COPY_AND_ASSIGN(AshTestEnvironmentDefault);
+};
+
+}  // namespace
+
+// static
+std::unique_ptr<AshTestEnvironment> AshTestEnvironment::Create() {
+  return base::MakeUnique<AshTestEnvironmentDefault>();
+}
+
+}  // namespace test
+}  // namespace ash