Moves ash content specific tests into ash_content_unittests

ash/test/ash_test_environment_default.cc

Index: ash/test/ash_test_environment_default.cc
diff --git a/ash/test/ash_test_environment_default.cc b/ash/test/ash_test_environment_default.cc
new file mode 100644
index 0000000000000000000000000000000000000000..f1d9d3280e87eb246058e77d6565ad0fb3f2b5bc
--- /dev/null
+++ b/ash/test/ash_test_environment_default.cc
@@ -0,0 +1,57 @@
+// 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/test/sequenced_worker_pool_owner.h"
+#include "base/threading/sequenced_worker_pool.h"
+
+namespace ash {
+namespace test {
+namespace {
+
+class AshTestEnvironmentDefault : public AshTestEnvironment {
+ public:
+  AshTestEnvironmentDefault() {}
+
+  ~AshTestEnvironmentDefault() override {
+    base::RunLoop().RunUntilIdle();
+    blocking_pool_owner_.reset();
+    base::RunLoop().RunUntilIdle();
+  }
+
+  // AshTestEnvironment:
+  base::SequencedWorkerPool* GetBlockingPool() override {
+    if (!blocking_pool_owner_) {
+      const size_t kMaxNumberThreads = 3u;  // Matches that of content.
+      const char kThreadNamePrefix[] = "AshBlocking";
+      blocking_pool_owner_ = base::MakeUnique<base::SequencedWorkerPoolOwner>(
+          kMaxNumberThreads, kThreadNamePrefix);
+    }
+    return blocking_pool_owner_->pool().get();
+  }
+  std::unique_ptr<views::ViewsDelegate> CreateViewsDelegate() override {
+    return base::MakeUnique<AshTestViewsDelegate>();
+  }
+
+ private:
+  base::MessageLoopForUI message_loop_;
+  std::unique_ptr<base::SequencedWorkerPoolOwner> blocking_pool_owner_;
+
+  DISALLOW_COPY_AND_ASSIGN(AshTestEnvironmentDefault);
+};
+
+}  // namespace
+
+// static
+std::unique_ptr<AshTestEnvironment> AshTestEnvironment::Create() {
+  return base::MakeUnique<AshTestEnvironmentDefault>();
+}
+
+}  // namespace test
+}  // namespace ash